Disable VRFY 8.7.11

Discuss your pilot or production implementation with other Zimbra admins or our engineers.
Posts: 1
Joined: Thu Nov 10, 2016 3:38 pm

Disable VRFY 8.7.11

Postby Sean225 » Sat Jun 17, 2017 3:37 pm

I would like to disable SMTP "VRFY" in Zimbra, I have 8.7.11 running. I have found one post on this forum on this topic, with no replies. So I wonder, is this even possible?

User avatar
Gren Elliot
Zimbra Employee
Zimbra Employee
Posts: 183
Joined: Tue Jun 10, 2014 4:45 am

Re: Disable VRFY 8.7.11

Postby Gren Elliot » Mon Jun 19, 2017 10:03 am

The underlying postfix MTA does support disabling it:

Code: Select all

postconf -d |grep vrf
disable_vrfy_command = no

Suggest submitting a request at https://bugzilla.zimbra.com/ to get this fully supported by Zimbra.

Also some interesting discussion at https://community.tenable.com/thread/6398
Postfix don't allow to specify a response code for EXPN or VRFY commands, it allow to make them "no operational" (smtpd_noop_commands = vrfy, expn) and allow to disable vrfy (disable_vrfy_command = yes).

In both case, Posfix will send a 250, without any answer. You could try anything, Postfix will always reply 250 OK.

Return to “Administrators”

Who is online

Users browsing this forum: Google [Bot] and 12 guests