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https://community.spiceworks.com/topic/360000-mail-flow-issue-mail-submission-failed-error-message-server-does-not-support
Dec 02, 2014 · Used MXtoolbox to test my email server and here are the results. Domain name and IP address have been changed for security purposes. 220 mail.companyname.com Microsoft ESMTP MAIL Service ready at Thu, 18 Jul 2013 08:28:13 -0400
https://www.experts-exchange.com/questions/26806036/Mail-submission-failed-Error-message-Server-does-not-support-secure-connections.html
IP (Receive mail from servers with this IP) = Only the source IP of the server that you want to submit and relay through the mail server 3. This should be an internal IP …
http://forums.msexchange.org/m_1800469418/mpage_1/key_/tm.htm
Mar 18, 2008 · Perhaps not coincidental. However the installation of the Exchange Server was done around a year ago and it would appear that the hub transport certificate has expired. I need to know how to renew this if anyone has any ideas.
https://forums.asp.net/t/1091403.aspx?+Server+does+not+support+secure+connections+error+with+SMTP+mail+and+SSL
Mar 26, 2007 · Are you running the IIS built-in SMTP-server or Exchange (or other external smpt-server)? Reason for the question is that I'm not quite sure how IIS does with the SMTP-server that's builtin when you install a server certificate for the Web server.
https://stackoverflow.com/questions/496566/error-server-does-not-support-secure-connections
Error: Server does not support secure connections. The company I for work created a windows service that does some stuff and then sends an email from gmail. In the beginning it sent the email just fine with no problems. After installing the service on a Vista machine we noticed it would not send the email.
https://social.technet.microsoft.com/Forums/office/en-US/86c30188-175c-4f9f-bc5d-197b75e61c72/server-does-not-support-secure-connections-but-it-does
Mail submission is the SMTP trafic on the Hub Transport service. It sounds a though you haven't turned on secure messaging on the HT role, and this doesn't have to be enabled. I normally only have secure smtp between my exchange servers not to the smart host.
https://www.experts-exchange.com/questions/22778170/Error-Submitting-Mail-from-Exchange-2007.html
I have telnet using port 25 and could send the email to an account on the exch server. But when I ran the troubleshooting assistant, and it gave some errors, I didn't know what to make of it. I tried looking up the info on MS website, and did not run into anything.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_mac/the-server-does-not-support-secure-connections/88332fdc-d90a-4fec-9217-0c76328fa170
The server does not support secure connections. Only on outgoing mail. The server is a Mac Server running 10.11. No other clients are having the same troubles. The clients are mainly 2011 outlooks and a few on 2016. Only one person if having this trouble.
http://forums.msexchange.org/m_1800515354/mpage_1/key_/tm.htm
Aug 14, 2009 · Please ensure that you have created a receive connector which allows anonymous users to submit mails to your server. This can be done via: - Exchange Management Console
https://social.technet.microsoft.com/Forums/en-US/c663b482-3ea3-4ee3-b263-d9bcb29f9f79/mail-submission-failed-cant-send-email
I had installed a UCC SSL successfully, and email was being sent normally, but then I suddenly found that email was not being sent to two addresses at different domain. What could suddenly cause the server to generate this error? Any leads on fixing or troubleshooting?
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