Edge dropping SMTP connections

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Edge dropping SMTP connections

An iPhone is dropping SMTP connections when connecting through the Edge network to our SMTP server (TCP Port 25). SMTP connections made over the local WIFI work fine.

Below is the log from the email server.

08-02-05 16:17:01 0005: Connection opened by mobile-032-153-238-198.mycingular.net [32.153.238.198]
08-02-05 16:17:01 0005: > 220 mail.accramfg.com ESMTP
08-02-05 16:17:01 0005: < NOOP
08-02-05 16:17:01 0005: > 250 ok
08-02-05 16:17:02 0005: < RSET
08-02-05 16:17:02 0005: > 250 ok
08-02-05 16:17:02 0005: < HELO [10.189.102.17]
08-02-05 16:17:02 0005: > 250 mail.accramfg.com
08-02-05 16:17:02 0005: Error: Connection closed by peer for no good reason [11]
08-02-05 16:17:02 0005: Connection closed with mobile-032-153-238-198.mycingular.net [32.153.238.198]

Anybody have any ideas?

Posted on Feb 19, 2008 3:13 PM

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Answer 1

AccraAdmin Author

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Feb 19, 2008 3:15 PM in response to AccraAdmin

FYI this editor is prepending "http://" to the IPs.

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Answer 2

Feb 19, 2008 3:21 PM in response to AccraAdmin

Is this your SMTP server or an SMTP server provided by the email account provider for the email account?

Who is your ISP used for connecting to the internet with your wireless network at home?

Is this SMTP server authenticated?

You will have problems with a non-authenticated SMTP server.

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Answer 3

AccraAdmin Author

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Feb 19, 2008 3:24 PM in response to Allan Sampson

This is my SMTP server.

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Answer 4

Feb 19, 2008 3:37 PM in response to AccraAdmin

Who is your ISP?

Most, if not all ISPs block the use of SMTP servers that are outside of their network on Port 25 and with other ports available unless the SMTP server is authenticated.

You cannot send via EDGE unless the SMTP server is authenticated with one exception - using AT&T's SMTP server for the account but using this SMTP server does not allow for sending when connected to other ISP's via a Wi-Fi network.

My personal account and business account have an authenticated SMTP server and I have no problems sending with either account when connected via EDGE or via the many different Wi-Fi networks with different ISPs.

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Answer 5

AccraAdmin Author

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Feb 19, 2008 4:10 PM in response to AccraAdmin

It is not a problem with my "ISP", my mail server is working just fine and can accept SMTP connections from pretty much anyone.

It is as if there is something on the edge network that is dropping the connection from the iPhone.

I would expect it next try to send:

> MAIL FROM:<xxx@accramfg.com>
> RCPT TO:<xxx@aa.com>
> DATA

But the connection is dropped from the Edge end.

If it was attempting to authenticate I should see something like:

< 220 mail.accramfg.com ESMTP
> EHLO [10.189.102.17]
< 250-mail.accramfg.com
< 250-ENHANCEDSTATUSCODES
250-ETRN
250-DSN
250-PIPELINING
250-8BITMIME
250-PRIORITY
250-CHUNKING
250-SIZE
250-AUTH=LOGIN
250-AUTH PLAIN LOGIN CRAM-MD5
250-XBDATA
> AUTH LOGIN
< 334 VXNlcm5hbWU6
> cG9wdXNlcg==
< 334 UGFzc3dvcmQ6
> OWk4dTd5
< 235 2.7.0 user successfully authenticated
> RSET
< 250 2.0.0 ok
> MAIL FROM:<xxx@accramfg.com>
< 250 2.1.0 originator <xxx@accramfg.com> ok
> RCPT TO:<xxx@aaa.com>
< 250 2.1.5 recipient <xxx@aaa.com> ok
> DATA
< 354 start mail input

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Answer 6

Feb 19, 2008 4:39 PM in response to AccraAdmin

I didn't say this was a problem with your ISP - I provided this as an example. Most, if not all ISPs block the use of SMTP servers that are outside of their network unless the SMTP server is authenticated.

I asked who is your ISP since you are using your own SMTP server on port 25 that is not provided by your ISP and is not authenticated.

Regardless the error message, you will not be able to use a non-authenticated SMTP server when connected via EDGE - unless you use AT&T's SMTP server provided for this purpose.

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