Authentication failure sending mail using postfixadmin users

mr buffy

9/24/23, 7:32 AM

I have setup a new mail server on Ubuntu 20.04 and using Postfixadmin so I can manage multiple mail domains.

The initial setup using unix users worked fine for sending and receiving email. However after installing Postfixadmin and using this tool to add users, I can no longer send emails. Receiving works fine.

I used this guide for setup: https://www.linuxbabe.com/mail-server/postfixadmin-create-virtual-mailboxes-debian

This is from the mail.log:

May 24 07:18:57 buffy postfix/smtpd[34224]: warning: unknown[5.34.207.123]: SASL LOGIN authentication failed: authentication failure
May 24 07:18:58 buffy postfix/smtpd[35176]: warning: /etc/postfix/main.cf, line 81: overriding earlier entry: virtual_alias_maps=hash:/etc/postfix/virtual
May 24 07:18:58 buffy postfix/smtpd[35176]: connect from ppp-171-96-190-198.revip8.asianet.co.th[171.96.190.198]
May 24 07:18:59 buffy postfix/smtpd[34224]: disconnect from unknown[5.34.207.123] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
May 24 07:18:59 buffy postfix/smtpd[35176]: Anonymous TLS connection established from ppp-171-96-190-198.revip8.asianet.co.th[171.96.190.198]: TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)
May 24 07:19:00 buffy postfix/smtpd[34604]: connect from unknown[5.34.207.123]
May 24 07:19:00 buffy postfix/smtpd[34217]: warning: unknown[5.34.207.123]: SASL LOGIN authentication failed: authentication failure
May 24 07:19:00 buffy postfix/smtpd[34217]: disconnect from unknown[5.34.207.123] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
May 24 07:19:02 buffy postfix/smtpd[35176]: warning: SASL authentication failure: Password verification failed
May 24 07:19:02 buffy postfix/smtpd[35176]: warning: ppp-171-96-190-198.revip8.asianet.co.th[171.96.190.198]: SASL PLAIN authentication failed: authentication failure
May 24 07:19:03 buffy postfix/smtpd[34224]: connect from unknown[5.34.207.123]

Can anyone give any tips on how to track down the error? I don't have much experience running mail servers so learning as I go!

Thanks

0 + 0

postfix

sendmail

dovecot

smtp-auth

Nikita Kipriyanov

9/24/23, 11:18 AM

Please provide your Postfix configuration using commands shown in the [tag description](https://serverfault.com/questions/tagged/postfix). Add them [into the question](https://serverfault.com/posts/1101662/edit). You may mask private details that identify you (globally routable IP addresses, DNS names), but make sure it stays consistent.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Authentication failure sending mail using postfixadmin users

TH: การตรวจสอบสิทธิ์ล้มเหลวในการส่งอีเมลโดยใช้ผู้ใช้ postfixadmin

RO: Eroare de autentificare la trimiterea e-mailurilor folosind utilizatorii postfixadmin

RU: Ошибка аутентификации при отправке почты с использованием пользователей postfixadmin

VI: Lỗi xác thực khi gửi thư bằng người dùng postfixadmin

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