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Article ID: 126777, created on Sep 1, 2015, last review on Sep 1, 2015

  • Applies to:
  • Plesk Automation 11.5


When trying to send a mail from Microsoft Outlook 2010 the loging/password prompt appears and do not accept the credentials. The warning as below is in the server mail log /usr/local/psa/var/log/maillog:

Aug 17 12:03:18 postfix/smtpd[17318]: warning: SASL authentication failure: realm changed: authentication aborted


Current implementation of DIGEST-MD5 mechanism in libsasl2 library is incompatible with Microsoft Outlook. Additional details can be found at the link below:


Disable Digest-MD5 for using on the mail service node:

  1. Backup the file /usr/lib64/sasl2/smtpd.conf
  2. Open this file for editing
  3. Replace there a line mech_list: DIGEST-MD5 CRAM-MD5 PLAIN LOGIN with mech_list: CRAM-MD5 PLAIN LOGIN
  4. Save file.

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