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Zimbra: Prevent send *SPAM* emails from self domain to self domain

Prevent send SPAM emails from self domain to self domain:

Modify file /opt/zimbra/conf/zmconfigd/smtpd_sender_restrictions.cf:

Add string: %%contains VAR:zimbraMtaSmtpdSenderRestrictions check_sender_access lmdb:/opt/zimbra/conf/postfix_sender_access%%

Result full content file:

%%exact VAR:zimbraMtaSmtpdSenderRestrictions reject_authenticated_sender_login_mismatch%%
%%contains VAR:zimbraMtaSmtpdSenderRestrictions check_sender_access lmdb:/opt/zimbra/conf/postfix_reject_sender%%
%%contains VAR:zimbraServiceEnabled cbpolicyd …
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