Sometimes
we mail server administrators are facing spamming problem from our mail server.
To make more secure your mail server it will be very helpful if you restrict
your sender local only. So that only
authenticated user can be able to send mail.
To increase the Security,
configure the below as user of Zimbra:
Step:1
Vim
/opt/zimbra/conf/zmconfigd/smtpd_sender_restrictions.cf
add
this line at the top
check_sender_access
lmdb:/opt/zimbra/postfix/conf/restricted_senders
Step:2
vim /opt/zimbra/conf/zmconfigd.cf
add
those lines
POSTCONF
smtpd_restriction_classes local_only
POSTCONF local_only FILE
postfix_check_recipient_access.cf
restart postfix (MTA)
Step:3
Create
a file “/opt/zimbra/conf/postfix_check_recipient_access.cf”
add
the following line
check_recipient_access
lmdb:/opt/zimbra/postfix/conf/local_domains, reject
Step:4
Create
a file “/opt/zimbra/postfix/conf/restricted_senders”
list
all the users, whom you want to restrict according to the following syntax:
user@yourdomain.com
local_only
Step: 5
Create
a file “/opt/zimbra/postfix/conf/local_domains”
list
all the domains where “restricted users” allowed to sent emails according to the
following syntax:
yourdomain.com
OK
otheralloweddomain.com OK
Step:6
Run
following commands
postmap /opt/zimbra/postfix/conf/restricted_senders
postmap /opt/zimbra/postfix/conf/local_domains
zmmtactl stop
zmmtactl start
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