Mail Outgoing server Problem (Mojave)

Dishant111 got it right... Run first aid on the disk. It solved the problem for me.

Yes.

Support told me that it is an issue system wide with sending mail over iCloud. It's not a user hardware or software issue. I've been able to receive mail on my iMac and iPhone, but not send. I can send directly from iCloud. They did not know how long it would take to resolve but they did spend a fair amount of time with me to explain it all.

Since 2 days, i was facing the same problem not only with iCloud but all my email accounts configured on my apple mail. To my surprise, i read somewhere and just run the first aid for the disk and it has finally worked out. All problems solved with mail and safari everything !

You might try if it works for you too :)

Cheers

I encountered the same problem this morning. I thought it was a Mojave issue, so I used

Time Machine to go back to High Sierra on my MacBook Pro. Same issue. Can't send

email. Neither can my wife on her MacBook Air. This is obviously an Apple SMTP server

issue. I can send email on iCloud using a browser.

A lot of people are reporting problems sending mail today (me too), so expect the problem to get fixed on Apple's side. You could try using iCloud.com on a web browser on a computer (not an iPhone or iPad), which sometimes works when the Mail app does not (that’s currently working for me).

A few updates ago I had this problem and Called AppleCare. After I did screen sharing with the tech rep, he recommended that I turn off the iCloud and that worked, for years. Today, I updated to OS X Mojave. I decided to sign into iCloud thinking that the problem had probably been resolved. This afternoon discovered that I can't send outgoing email on my mac or my iPhone. Turned off iCloud and all my emails went to their destination. I hope this keeps working but who knows. I don't store anything of value in the iCloud. I have everything on Time Machine and on thumb drives.

I cannot send mail directly from icloud either. I have deleted the account and reentered it, but the mails will only go with google, which then seizes control and uses a gmail address, which I do not want. i prefer to use apple mail because, as far as I know, it is about the only one of the big boys which does not sell its clients on, unlike google and the suckerburger. The strange thing is that it works perfectly form my iphone! Usually it is more trouble to get things to work from the phone than from the computer.

Worked for me too. I unchecked "Mail" in the Icloud account box in MacMail. Then I could send again.

I don't think this is related to your Mojave upgrade; I just started having similar problems on my Sierra iMac as well as my iPhone. It appears others have been having problems starting about 6 hours ago:

https://downdetector.com/status/icloud

You may also find this site helpful:

https://www.apple.com/support/systemstatus/

Good luck!

I've been able to send using the browser as well, I'm able to receive on my devices but in order to send I've just been using that in the meantime. I'm also having issues on my iPhone with sending email, so at least for me it is affecting both iOS and OSX.

I am also having this problem. However, it is only when I use Mail itself on my desktop. (iMac, purchased late 2015). I did the upgrade this morning and ever since, Mail will not send. However, if I go to iCloud, then I can use mail. I can use Google mail, no problem. I checked with Connection Doctor and it shows that the SMTP account is not connecting to the server. I have no trouble receiving incoming mail. Connection Doctor shows the IMAP account as green and confirms a connection to the server. Internet functionality is fine, both in Safari and Chrome. I have 2 other accounts and they are working. Its just Mail.

This is very frustrating.

I logged out of my machine; I restarted my machine; I logged out of Mail; I removed Mail from my Dock and opened it directly from File>applications; I reset my IP address; I unplugged my router......nothing seems to make a difference....

Just noticed that it is also impacting my iPhone. I can send using my desktop browser only.

I wonder how widespread this is. That happened to me as well. It started off happening every so often then progressed to a permanent state.

The last email I was able to send was last night. Then it stopped working a minute later.