Troubleshooting a connection issue

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• B

  Bill

  12/11/23, 9:06 AM

  Good morning,

  I have an e-mail that I am unable to send to what I guess is a small ISP.  In trying to troubleshoot the issue I have looked at the log and not much useful appears to be there.  I turned up logging to Debug and tried again, and all I got was this:

  Mon 2023-12-11 09:12:06: --> STARTTLS

  Mon 2023-12-11 09:12:06: <-- 220 2.0.0 Ready for TLS

  Mon 2023-12-11 09:12:06: CSmtpSocket::OnClose nErrorCode=0

  Mon 2023-12-11 09:12:06: ** SMTP session terminated (Bytes in/out: 270/44)

   

  In testing with Telnet the connection is aborting right after I issue the STARTTLS command, but works ok if I don't, so I am guessing this is a TLS issue of some kind.  Is there a way I can override mail to this domain to NOT use TLS even though their SMTP is advertising support for it? 
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• A

  Arron Staff

  12/11/23, 9:17 AM

  In SecurityGatetay, go to Setup|Users / System / Encryption, enter the domain name you are trying to send to in the STARTTLS Allowlist.  This should cause SecurityGateway to not use STARTTLS when sending mail to the domain.

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  Arron Caruth

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