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https://www.howtoforge.com/community/threads/smtp-auth-failure-server-does-not-support-secure-authentication.6738/
Sep 12, 2006 · The main problem however, is that the remote mail client is told that the server does not support secure authentication, before I have a chance to send a password.
http://xmodulo.com/enable-user-authentication-postfix-smtp-server-sasl.html
Jan 28, 2014 · With SASL enabled, Postfix will not accept any incoming SMTP connections without proper authentication. As smart spammer can imitate a legitimate email account, no SMTP from even internal users are accepted without authentication. This tutorial will focus on setting up a Postfix SMTP server to use Dovecot SASL for user authentication. As Dovecot provides mechanisms for user authentication, Postfix …
https://support.desk.com/customer/en/portal/articles/983029-smtp-and-imap-authentication-errors
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://groups.google.com/d/topic/linux.debian.user/gtQYDvl9dGw
Auhentication failure [SMTP: SMTP server does not support authentication (code: 250, response: def.com PIPELINING SIZE 20971520 VRFY ETRN ENHANCEDS #Logs Cyrus.
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://bbs.archlinux.org/viewtopic.php?id=111392
Jan 12, 2011 · Based on the comments in the config regarding the smtp_user and smtp_pass variables, and since you aren't using smtp authentication (you are using mynetworks ip based ACL), you should look for a way to disable smtp auth in roundcube.
https://forum.iredmail.org/topic3755-iredmail-support-problem-with-roundcube-when-tls-in-postfix-is-turned-on.html
Aug 03, 2012 · Problem with roundcube when TLS in postfix is turned on (Page 1) — iRedMail Support — iRedMail — Works on Red Hat Enterprise Linux, CentOS, Debian, Ubuntu, FreeBSD, OpenBSD
https://blog.tinned-software.net/setup-postfix-with-smtp-auth-and-tls-on-centos/
Installing Postfix and Cyrus. We need to install the postfix and cyrus (for SMTP authentication) packages on the server. Usually at this point I block incoming traffic to the postfix daemon (port 25) via iptable rules. This is to avoid someone sending through postfix as long as it is not configured.
http://www.postfix.org/SASL_README.html
The Postfix SMTP client does not support the obsolete "wrappermode" protocol, which uses TCP port 465 on the SMTP server. See TLS_README for a solution that uses the stunnel command. With the smtp_sasl_password_maps parameter, we configure the Postfix SMTP client to send username and password information to the mail gateway server.
http://www.postfix.org/TLS_README.html
The above client pre-requisites do not apply to the Postfix SMTP server. It will support DANE provided it supports TLSv1 and its TLSA records are published in a DNSSEC signed zone. To receive DANE secured mail for multiple domains, use the same hostname to add the server …
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