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Disable SSLv2 in Atmail Dovecot

Stewart -

PROBLEM

I need to disable SSLv2 for my atmail IMAP.

ENVIRONMENT

  • On-Premise Server + WebMail Installations: Version 6.0 > Current Version

CAUSE

Security requirement.

RESOLUTION

Disabling SSLv2 in Dovecot is relatively easy

Open and edit /usr/local/atmail/mailserver/etc/dovecot.conf.

Locate:

login_user = atmailimap

Add the following above:

ssl_cipher_list = ALL:!ADH:!LOW:!SSLv2:!SSLv3:!EXP:!aNULL:+HIGH:+MEDIUM

Example:

ssl_cipher_list = ALL:!ADH:!LOW:!SSLv2:!SSLv3:!EXP:!aNULL:+HIGH:+MEDIUM
login_user = atmailimap 

Afterwards, save changes and restart atmail services.

/etc/init.d/atmailserver restart
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