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https://discussions.apple.com/thread/2308311
Jan 22, 2010 · What am I doing wrong in setting up my mail account which prohibits it from sending e-mail on Wi-Fi? I have the latest version of iTUNES so that is not the issue. Is this a port problem? My outgoing server port is set to 25 and my incoming server port is set to 110. My SSL setting is set to off. Also I am using password authentication.
http://forums.mozillazine.org/viewtopic.php?f=28&t=1858105
Apr 19, 2010 · It does not support authentication (SMTP-AUTH) but you have chosen to use authentication. Uncheck 'Use name and password' for that server or contact your service provider." Because I had deleted and set up the account again, I immediately suspected that I had an option set up that the ISP couldn't handle.
https://support.mozilla.org/en-US/questions/686479
It does not support authentication (SMTP-AUTH) but you have chosen to use authentication. Uncheck 'Use name and password' for that server or contact your service provider. == This happened == Every time Firefox opened == I upgraded to new version
https://forums.cacti.net/about30899.html
Mar 13, 2009 · ERROR: SMTP Host does not appear to support authenication: 503 5.5.2 Send hello first. SMTP Host does not appear to support authenication: 503 5.5.2 Send hello first. I think Thold only supports HELO authentication but not EHLO which my mail system authentication.
https://support.desk.com/customer/en/portal/articles/983029-smtp-and-imap-authentication-errors
What is authentication? When you use email in Desk.com, IMAP or SMTP is used to send or receive the email. Communication is opened between the Desk.com servers and your mail server, and Usernames and Passwords are used to authenticate the user. All IMAP servers require authentication, but some SMTP mail servers do not require authentication.
https://github.com/roundcube/roundcubemail/issues/3944
Sep 24, 2012 · Comment by @alecpl on 24 Sep 2012 08:07 UTC. Did you try with empty smtp_user and smtp_password? It should work. Also we don't support 'accounts' plugin. Try without it.
https://forum.netgate.com/topic/65163/cannot-send-mails-using-office365-smtp-server
Cannot send mails using office365 smtp server Cannot send mails using office365 smtp server ... Enable SMTP over SSL/TLS -> Error: could not connect to the host "smtp.office365.com": ?? (and fails very quickly) ... seems to support several Authentication mechanisms for SMTP (at least that's what I gathered from the various files), but it ALWAYS ...
https://serverfault.com/questions/712903/503-5-5-1-error-authentication-not-enabled-when-trying-to-connect-to-my-postf
If, as you stated in your comments on the other answer, you do not want incoming authentication then you tested the wrong thing. Enabling outgoing SMTP AUTH is a separate topic and you should open a separate question for it.
https://serversmtp.com/smtp-error/
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