Allow only few users to send mails

Allow only few users to send mails

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Requirement "in a domain there may be a requirement of restricting few users from sending mails (local or public) while allowing other users to send mails" .

Here is how to implement the requirement in zimbra. If using elsewhere please make sure to change the domain.

a) In /opt/zimbra/conf enter following lines in zmmta.cf

POSTCONF smtpd_sender_restrictions FILE postfix_sender_restrictions.cf

b) Modify postfix_sender_restrictions.cf to add following line to the top of the file: -

check_sender_access hash:/opt/zimbra/conf/sender_acl reject

c) In /opt/zimbra/conf/sender_acl add all the users in the domain:-

test1@test.in.zimbra.com DUNNO

test2@test.in.zimbra.com DUNNO

test3@test.in.zimbra.com REJECT

test.in.zimbra.com REJECT

d) We need to postmap sender_acl using :-

postmap /opt/zimbra/conf/sender_acl

This creates a hashed db file of users which is referenced every time mail is sent from the domain.

e) Restart postfix as a zimbra user

  postfix restart