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https://foursixnine.io/blog/2019/09/27/Roundcube-smtp-(250)-authentication-failed.html
You have tried everything, but still can’t seem to be able to send email from roundcube, you keep getting this annoying “SMTP (250) authentication failed” notification, every time you click “Send”. Well… Make sure that your server is connecting to the right place.
https://lists.debian.org/debian-user/2013/02/msg00245.html
Hello ! I try sent a email via web, come this errors. I searched for many sites, but i not found I have postfix, cyrus and LDAP included. # When sent mail for firefox Auhentication failure [SMTP: SMTP server does not support authentication (code: 250, response: def.com PIPELINING SIZE 20971520 VRFY ETRN ENHANCEDS #Logs Cyrus.
https://www.howtoforge.com/community/threads/smtp-auth-failure-server-does-not-support-secure-authentication.6738/
Sep 12, 2006 · Just for fun, I specified mynetworks_style = host, and authentication from my lan (on the same subnet) failed. So, I guess it isn't authenticating at all, but was allowing relaying because the machines are on the same sbunet. And nothing at all is added to the log when I get the message "Mail server does not support secure authentication".
https://stackoverflow.com/questions/40084139/smtp-error-250-authentication-failed-through-roundcubemail
I am pretty new on setting up webservices and i only have basic knowledge on networks, and i am trying to set one web service on a local server, to receive and send mail through an mail server …
https://groups.google.com/d/topic/linux.debian.user/gtQYDvl9dGw
SMTP server does not support authentication Showing 1-7 of 7 messages. ... I have postfix, cyrus and LDAP included. # When sent mail for firefox. Auhentication failure [SMTP: SMTP server does not support authentication (code: 250, response: ... > What I said was the server doesn't accept authentication. And yes, I
https://forum.iredmail.org/topic3531-iredmail-support-smtp-error-250-authentication-failure.html
Jun 18, 2012 · SMTP Error (250): authentication failure (Page 1) — iRedMail Support — iRedMail — Works on Red Hat Enterprise Linux, CentOS, Debian, Ubuntu, FreeBSD, OpenBSD
https://forum.osticket.com/d/89512-authentication-failure-smtp-smtp-server-does-not-support-authentication-code-250-response-bn6p
I also have a few other devices/services sending emails out as well authenticating through the smtp server. But what is really getting me about this problem is that it says the server does not support authentication (SMTP server does not support authentication) but yet it needs to authenticate (STARTTLS)... if I reading the errors correctly.
https://answers.microsoft.com/en-us/windowslive/forum/livemail-email/unable-to-send-server-error-250-0x00ccc7d/226c5c32-2a29-4381-9e5c-7e2d4c0712ab
Oct 12, 2014 · This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread.
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://talk.plesk.com/threads/smtp-authentication-not-working-does-not-support-authentication.84656/
Apr 13, 2010 · Does SMTP Authentication not work in Plesk 8.6.0? This seems like quite an issue. A few notes: Yes - under Server - Mail settings for Plesk I have it set to Authentication is required (SMTP is checked, POP3 locktime text field left blank and also unchecked).
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