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Mail is not working on a Plesk server: fatal: no SASL authentication mechanisms

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Kuzma Ivanov
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Plesk for Linux kb: technical

Applicable to:

  • Plesk for Linux

Symptoms

Emails are not being sent from a Plesk server with the following error message in /var/log/maillog :

CONFIG_TEXT: postfix/smtpd[25002]: warning: SASL: Connect to private/auth failed: Connection refused
postfix/smtpd[25002]: fatal: no SASL authentication mechanisms

Cause

The parameter smtpd_sasl_type is defined in the file /etc/postfix/main.cf:

# grep smtpd_sasl_type /etc/postfix/main.cf
smtpd_sasl_type = ***

By default, Postfix configured by Plesk uses the Cyrus SASL plug-in type.

Resolution

  1. Connect to the Plesk server via SSH.

  2. Open the file /etc/postfix/main.cf in a text editor. In this example, we are using the vi editor:

    # vi /etc/postfix/main.cf

  3. Remove the line with smtpd_sasl_type parameter.

  4. Save the chnages and close the file

  5. Reload the Postfix service:

    # service postfix reload

Comments

3 comments

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    Yves YperLine

    I have the same problem and my string is smtp_sasl_type = dovecot

    If the string smtp_sasl_type is removed, does that mean sasl is disabled ?

     

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    Konstantin Annikov

    Hello Yves, 

    The smtp_sasl_type parameter is defined to choose he SASL plug-in type that the Postfix SMTP client should use for authentication. The available types are listed with the "postconf -A" command.

    If the string is not defined, the SASL authentication will be still in use, but without plugins. If it is needed to disable SASL authentication, please change the 

    smtpd_sasl_auth_enable =yes

    to 

    smtpd_sasl_auth_enable = no 

    In the same configuration file. 

    You can read more about both parameters in official postfix documentation: 

    http://www.postfix.org/postconf.5.html#smtp_sasl_type

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    Yves YperLine

    Thank you Konstantin.  You give me the exact solution.

    Indeed ! postconf -A  gives cyrus.

    So, I changed smptd_sasl_type = dovecot  to  smptd_sasl_type = cyrus

    It seems it works fine now ! 

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