Add SMTP headers to mails

Yes, saw that post. Thing is, mail changed location of files and how they are configured. So this no longer works.

It would need to be a way to insert the command at the SMTP level, but I don't find which file to edit. Any suggestions?

I used the command, and the following are the headers that come up (hoping the formatting doesn't get lost in the copying, deleted the sensitive info):

To: myself at a server who I know delivers DSN from trying with another client

Content-Type: text/plain; charset=us-ascii

Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\))

X-Universally-Unique-Identifier:

Requestdsn: SUCCESS,FAILURE,DELAY

Reportdsn: HDRS

Content-Transfer-Encoding: 7bit

X-Smtp-Server: smtp://@p03-smtp.mail.me.com

Message-Id: <>

test DNS mail

In the com.apple.mail the command

defaults write com.apple.mail UserHeaders '{"requestDSN" = "SUCCESS,FAILURE,DELAY"; "reportDSN" = "HDRS";}'

added changed the very end of the file as:

};

ThreadingDefault = 0;

UserHeaders = {

reportDSN = HDRS;

requestDSN = "SUCCESS,FAILURE,DELAY";

};

WebContinuousSpellCheckingEnabled = 1;

junkMailTrustHeaders = 1;

}

Somehow I guess I need to tell com.apple.mail to instruct these commands at the time apple mail talks to the SMTP server?

Yes, I did do quit mail before modifying the settings.

I also tried the settings one at a time.

Mail puts them into the mail header instead of giving the instruction to the smtp server.

Maybe UserHeaders is not the right descriptor to put the instruction at the right time, and should be something like smtpHeaders? Or directly at an already existing descriptor?

Since I see no instructions in com.apple.mail for the smtp server, maybe this should be stated in another file then com.apple.mail?

I copy the full defaults read com.apple.mail below:

{

AddInvitationsToICalAutomatically = 0;

AddressDisplayMode = 4;

DefaultViewerState = {

DisplayInThreadedMode = yes;

FavoritesBarVisible = 1;

FormatVersion = 1;

MailboxSplitPosition = 213;

SearchPopupTag = 3;

SelectedMailboxes = (

"Sent Messages"

);

SelectedMessageIDs = {

"///MessageList///" = (

77

);

};

ShowDeletedMessages = 1;

SortOrder = "received-date";

SortedDescending = 1;

ToolbarIsHidden = 0;

};

DefaultWindowState = {

dictionaryRepresentation = {

DisplayInThreadedMode = yes;

FavoritesBarVisible = 1;

FormatVersion = 1;

MailboxSplitPosition = 213;

SearchPopupTag = 3;

SelectedMailboxes = (

"Sent Messages"

);

SelectedMessageIDs = {

"///MessageList///" = (

77

);

};

ShowDeletedMessages = 1;

SortOrder = "received-date";

SortedDescending = 1;

ToolbarIsHidden = 0;

};

splitViewDescription = (

"0.000000, 0.000000, 938.000000, 668.000000, NO",

"270.000000, 0.000000, 796.000000, 668.000000, YES"

);

verticalSplitViewDescription = (

"0.000000, 0.000000, 213.000000, 668.000000, NO",

"214.000000, 0.000000, 948.000000, 668.000000, NO"

);

windowFrame = "0 62 1162 716 0 0 1280 778 ";

};

DidUpgradeDocumentEditorsToTAL = 1;

DidUpgradeMessageViewersToTAL = 1;

DidUpgradeSingleMessageViewersToTAL = 1;

Favorites = (

{

IsPrefferedSelection = 0;

MailboxUidIsContainer = 1;

MailboxUidName = Inbox;

MailboxUidPersistentIdentifier = Inbox;

MailboxUidType = 100;

},

{

IsPrefferedSelection = 0;

MailboxUidIsContainer = 1;

MailboxUidName = Sent;

MailboxUidPersistentIdentifier = "Sent Messages";

MailboxUidType = 102;

}

);

FavoritesVersion = 2;

FlagColorToDisplay = 0;

FlagNames = {

0 = Red;

1 = Orange;

2 = Yellow;

3 = Green;

4 = Blue;

5 = Purple;

6 = Gray;

};

HasSetupIndexingDefaults = 1;

IMAPServerPrefixesMirrorFilesystem = 1;

InboxViewerAttributes = {

DisplayInThreadedMode = yes;

SortOrder = "received-date";

SortedDescending = YES;

};

IndexTrash = 1;

JunkMailBehavior = 1;

Locations = (

{

AccountDefaults = {

};

Identities = {

"192.168.1" = (

);

};

}

);

MailSections = (

MailboxesSection,

SmartMailboxesSection,

"local:///",

"imap://**@mail.mac.com/"

);

MailShowFlags = 0;

MailUpgraderVersion = 8;

MailVisibleFlagsMailboxes = (

);

MailVisibleSections = (

MailboxesSection,

SmartMailboxesSection,

"imap://**@mail.mac.com/"

);

MessageListNextMessageDirection = 2;

NSPreferencesContentSize = "{550, 489}";

NSPreferencesSelectedIndex = 1;

"NSSplitView Subview Frames Main Window" = (

"0.000000, 0.000000, 213.000000, 668.000000, NO",

"214.000000, 0.000000, 948.000000, 668.000000, NO"

);

"NSSplitView Subview Frames Main Window Preview Pane" = (

"0.000000, 0.000000, 938.000000, 668.000000, NO",

"270.000000, 0.000000, 796.000000, 668.000000, YES"

);

"NSToolbar Configuration ComposeWindow_NewMessage" = {

"TB Display Mode" = 2;

};

"NSToolbar Configuration ComposeWindow_ReplyOrForward" = {

"TB Display Mode" = 2;

};

"NSToolbar Configuration MainWindow" = {

"TB Default Item Identifiers" = (

"checkNewMail:",

"showComposeWindow:",

NSToolbarSpaceItem,

NSToolbarFlexibleSpaceItem,

"delete_junk",

"reply_replyAll_forward",

FlaggedStatus,

NSToolbarFlexibleSpaceItem,

Search

);

"TB Display Mode" = 2;

};

"NSToolbar Configuration NSPreferences" = {

"TB Display Mode" = 1;

"TB Icon Size Mode" = 1;

"TB Is Shown" = 0;

"TB Size Mode" = 1;

};

"NSToolbar Configuration SingleMessageViewer" = {

"TB Display Mode" = 2;

};

"NSWindow Frame Compose Window" = "341 62 640 594 0 0 1280 778 ";

"NSWindow Frame Preferences" = "42 100 593 390 0 0 1280 778 ";

SentMessagesViewerAttributes = {

DisplayInThreadedMode = yes;

SortOrder = "received-date";

SortedDescending = YES;

};

ShowHeaderDetails = 1;

ShowPresence = 1;

SignatureSelectionMethods = {

"c71dd99e-84ef-40c4-b85b-77849164372b" = SelectedOnly;

};

SignaturesSelected = {

};

SpellCheckingBehavior = InlineSpellCheckingEnabled;

TableColumns = {

normal = {

0 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 0;

isVisible = 1;

position = 1;

positionWhileSearching = 1;

widthWithLocation = 20;

widthWithThreading = 0;

widthWithThreadingWithLocation = 0;

widthWithoutRankAndLocation = 20;

widthWithoutThreading = 20;

widthWithoutThreadingWithLocation = 20;

};

10 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 10;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 50;

widthWithThreading = 50;

widthWithThreadingWithLocation = 50;

widthWithoutRankAndLocation = 50;

widthWithoutThreading = 50;

widthWithoutThreadingWithLocation = 50;

};

11 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 1;

columnIdentifier = 11;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 46;

widthWithThreading = 46;

widthWithThreadingWithLocation = 46;

widthWithoutRankAndLocation = 46;

widthWithoutThreading = 46;

widthWithoutThreadingWithLocation = 46;

};

13 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 13;

isVisible = 1;

position = 2;

positionWhileSearching = 2;

widthWithLocation = 20;

widthWithThreading = 20;

widthWithThreadingWithLocation = 20;

widthWithoutRankAndLocation = 20;

widthWithoutThreading = 20;

widthWithoutThreadingWithLocation = 20;

};

14 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 14;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 28;

widthWithThreading = 28;

widthWithThreadingWithLocation = 28;

widthWithoutRankAndLocation = 28;

widthWithoutThreading = 28;

widthWithoutThreadingWithLocation = 28;

};

15 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 15;

isVisible = 0;

position = 0;

positionWhileSearching = 0;

widthWithLocation = 18;

widthWithThreading = 18;

widthWithThreadingWithLocation = 18;

widthWithoutRankAndLocation = 18;

widthWithoutThreading = 18;

widthWithoutThreadingWithLocation = 18;

};

16 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 16;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 81;

widthWithThreading = 81;

widthWithThreadingWithLocation = 81;

widthWithoutRankAndLocation = 81;

widthWithoutThreading = 81;

widthWithoutThreadingWithLocation = 81;

};

17 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 17;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 10;

widthWithThreading = 10;

widthWithThreadingWithLocation = 10;

widthWithoutRankAndLocation = 10;

widthWithoutThreading = 10;

widthWithoutThreadingWithLocation = 10;

};

18 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 18;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 75;

widthWithThreading = 75;

widthWithThreadingWithLocation = 75;

widthWithoutRankAndLocation = 75;

widthWithoutThreading = 75;

widthWithoutThreadingWithLocation = 75;

};

19 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 19;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 64;

widthWithThreading = 64;

widthWithThreadingWithLocation = 64;

widthWithoutRankAndLocation = 64;

widthWithoutThreading = 64;

widthWithoutThreadingWithLocation = 64;

};

2 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 2;

isVisible = 1;

position = 4;

positionWhileSearching = 4;

widthWithLocation = 100;

widthWithThreading = 100;

widthWithThreadingWithLocation = 100;

widthWithoutRankAndLocation = 100;

widthWithoutThreading = 100;

widthWithoutThreadingWithLocation = 100;

};

20 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 20;

isVisible = 0;

position = 0;

positionWhileSearching = "-1";

widthWithLocation = 250;

widthWithThreading = 938;

widthWithThreadingWithLocation = 250;

widthWithoutRankAndLocation = 250;

widthWithoutThreading = 250;

widthWithoutThreadingWithLocation = 250;

};

3 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 3;

isVisible = 1;

position = 5;

positionWhileSearching = 5;

widthWithLocation = 81;

widthWithThreading = 81;

widthWithThreadingWithLocation = 81;

widthWithoutRankAndLocation = 81;

widthWithoutThreading = 81;

widthWithoutThreadingWithLocation = 81;

};

4 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 4;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 25;

widthWithThreading = 25;

widthWithThreadingWithLocation = 25;

widthWithoutRankAndLocation = 25;

widthWithoutThreading = 25;

widthWithoutThreadingWithLocation = 25;

};

5 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 1;

columnIdentifier = 5;

isVisible = 1;

position = 3;

positionWhileSearching = 3;

widthWithLocation = 75;

widthWithThreading = 75;

widthWithThreadingWithLocation = 75;

widthWithoutRankAndLocation = 75;

widthWithoutThreading = 75;

widthWithoutThreadingWithLocation = 75;

};

6 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 6;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 20;

widthWithThreading = 20;

widthWithThreadingWithLocation = 20;

widthWithoutRankAndLocation = 20;

widthWithoutThreading = 20;

widthWithoutThreadingWithLocation = 20;

};

7 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 7;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 44;

widthWithThreading = 44;

widthWithThreadingWithLocation = 44;

widthWithoutRankAndLocation = 44;

widthWithoutThreading = 44;

widthWithoutThreadingWithLocation = 44;

};

8 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 8;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 75;

widthWithThreading = 75;

widthWithThreadingWithLocation = 75;

widthWithoutRankAndLocation = 75;

widthWithoutThreading = 75;

widthWithoutThreadingWithLocation = 75;

};

9 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 9;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 20;

widthWithThreading = 20;

widthWithThreadingWithLocation = 20;

widthWithoutRankAndLocation = 20;

widthWithoutThreading = 20;

widthWithoutThreadingWithLocation = 20;

};

};

outgoing = {

0 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 0;

isVisible = 1;

position = 1;

positionWhileSearching = 1;

widthWithLocation = 20;

widthWithThreading = 0;

widthWithThreadingWithLocation = 0;

widthWithoutRankAndLocation = 20;

widthWithoutThreading = 20;

widthWithoutThreadingWithLocation = 20;

};

10 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 10;

isVisible = 1;

position = 5;

positionWhileSearching = 5;

widthWithLocation = 50;

widthWithThreading = 81;

widthWithThreadingWithLocation = 81;

widthWithoutRankAndLocation = 50;

widthWithoutThreading = 81;

widthWithoutThreadingWithLocation = 81;

};

11 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 1;

columnIdentifier = 11;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 46;

widthWithThreading = 46;

widthWithThreadingWithLocation = 46;

widthWithoutRankAndLocation = 46;

widthWithoutThreading = 46;

widthWithoutThreadingWithLocation = 46;

};

13 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 13;

isVisible = 1;

position = 2;

positionWhileSearching = 2;

widthWithLocation = 20;

widthWithThreading = 20;

widthWithThreadingWithLocation = 20;

widthWithoutRankAndLocation = 20;

widthWithoutThreading = 20;

widthWithoutThreadingWithLocation = 20;

};

14 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 14;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 28;

widthWithThreading = 28;

widthWithThreadingWithLocation = 28;

widthWithoutRankAndLocation = 28;

widthWithoutThreading = 28;

widthWithoutThreadingWithLocation = 28;

};

15 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 15;

isVisible = 0;

position = 0;

positionWhileSearching = 0;

widthWithLocation = 18;

widthWithThreading = 18;

widthWithThreadingWithLocation = 18;

widthWithoutRankAndLocation = 18;

widthWithoutThreading = 18;

widthWithoutThreadingWithLocation = 18;

};

16 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 16;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 81;

widthWithThreading = 81;

widthWithThreadingWithLocation = 81;

widthWithoutRankAndLocation = 81;

widthWithoutThreading = 81;

widthWithoutThreadingWithLocation = 81;

};

17 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 17;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 10;

widthWithThreading = 10;

widthWithThreadingWithLocation = 10;

widthWithoutRankAndLocation = 10;

widthWithoutThreading = 10;

widthWithoutThreadingWithLocation = 10;

};

18 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 18;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 75;

widthWithThreading = 75;

widthWithThreadingWithLocation = 75;

widthWithoutRankAndLocation = 75;

widthWithoutThreading = 75;

widthWithoutThreadingWithLocation = 75;

};

19 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 19;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 64;

widthWithThreading = 64;

widthWithThreadingWithLocation = 64;

widthWithoutRankAndLocation = 64;

widthWithoutThreading = 64;

widthWithoutThreadingWithLocation = 64;

};

2 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 2;

isVisible = 1;

position = 4;

positionWhileSearching = 4;

widthWithLocation = 100;

widthWithThreading = 100;

widthWithThreadingWithLocation = 100;

widthWithoutRankAndLocation = 100;

widthWithoutThreading = 100;

widthWithoutThreadingWithLocation = 100;

};

20 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 20;

isVisible = 0;

position = 0;

positionWhileSearching = "-1";

widthWithLocation = 250;

widthWithThreading = 938;

widthWithThreadingWithLocation = 250;

widthWithoutRankAndLocation = 250;

widthWithoutThreading = 250;

widthWithoutThreadingWithLocation = 250;

};

3 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 3;

isVisible = 0;

position = 5;

positionWhileSearching = 5;

widthWithLocation = 81;

widthWithThreading = 81;

widthWithThreadingWithLocation = 81;

widthWithoutRankAndLocation = 81;

widthWithoutThreading = 81;

widthWithoutThreadingWithLocation = 81;

};

4 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 4;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 25;

widthWithThreading = 25;

widthWithThreadingWithLocation = 25;

widthWithoutRankAndLocation = 25;

widthWithoutThreading = 25;

widthWithoutThreadingWithLocation = 25;

};

5 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 1;

columnIdentifier = 5;

isVisible = 0;

position = 3;

positionWhileSearching = 3;

widthWithLocation = 75;

widthWithThreading = 75;

widthWithThreadingWithLocation = 75;

widthWithoutRankAndLocation = 75;

widthWithoutThreading = 75;

widthWithoutThreadingWithLocation = 75;

};

6 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 6;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 20;

widthWithThreading = 20;

widthWithThreadingWithLocation = 20;

widthWithoutRankAndLocation = 20;

widthWithoutThreading = 20;

widthWithoutThreadingWithLocation = 20;

};

7 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 7;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 44;

widthWithThreading = 44;

widthWithThreadingWithLocation = 44;

widthWithoutRankAndLocation = 44;

widthWithoutThreading = 44;

widthWithoutThreadingWithLocation = 44;

};

8 = {

automaticInsertionOkay = 1;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 8;

isVisible = 1;

position = 3;

positionWhileSearching = 3;

widthWithLocation = 75;

widthWithThreading = 75;

widthWithThreadingWithLocation = 75;

widthWithoutRankAndLocation = 75;

widthWithoutThreading = 75;

widthWithoutThreadingWithLocation = 75;

};

9 = {

automaticInsertionOkay = 0;

automaticInsertionWhileSearchingOkay = 0;

columnIdentifier = 9;

isVisible = 0;

position = "-1";

positionWhileSearching = "-1";

widthWithLocation = 20;

widthWithThreading = 20;

widthWithThreadingWithLocation = 20;

widthWithoutRankAndLocation = 20;

widthWithoutThreading = 20;

widthWithoutThreadingWithLocation = 20;

};

};

};

ThreadingDefault = 1;

UserHeaders = {

reportDSN = HDRS;

};

WebContinuousSpellCheckingEnabled = 1;

junkMailTrustHeaders = 1;

}

I'm trying to get apple mail to send emails with an instruction to the SMTP server to request delivery status notifications on all emails that are being sent.

Third party mail clients offer this possibility (thunderbird, postbox, gyazmail, mailmate, etc.) but so far I didn't find how apple mail can be told to request for DSN.

Apparently it is done by specifying esmtp-keywords to the RCPT commands and/or MAIL commands

So, what I am trying to do is to tell mail to obtain DSN's on the emails I send, as described in rfc3461

Do you know the files location with the instructions mail uses to communicate with a mailserver? I could try to search from there, but I don't know which configuration files mail uses for communicating to smtp servers. Thanks!

Re-reading my message I understand your answer, it was not very clear. I'm on a steep learning curve and mix up terms.

I meant, which is the configuraiton file holding information such as which account uses which smtp server, with which port, security type, etc.

The file accounts.plist contains useful "keys" for sending emails, the information of those "keys" was in previous versions of OSX in com.apple.mail.plist, and one could add information there.

I tried to add informaiton to the accounts.plist, but when I do that and start mail, mail starts up showing the account configuration panel as if mail is being run for the first time.

Is there a manual or explanation for the syntax used in the accounts.plist file?

Also, the accounts.plist file does not contain the smtp server address itself. In fact, I couldn't find a file in ~/Library/Mail that contains the smtp server addresses for the smtp servers configured in apple mail. Where would these be stored?

Thanks for helping out.