Sometimes users will blacklist their own domains by mistake.

Check internal users

Use the ldapsearch command as the zimbra user to find out who's blocking internal domains.

source ~/bin/zmshutil; zmsetvars

ldapsearch -LLL -h -D $zimbra_ldap_userdn -w $zimbra_ldap_password 'amavisBlacklistSender=*' displayName mail amavisBlacklistSender

Example from the ldapsearch results.

dn: uid=jramerez,ou=people,dc=example,dc=com
displayName: Jake Ramerez

Update and remove

Once you find the account that was blacklisting the internal domain, update it; here's an example.

zmprov ma -amavisBlacklistSender ""          <<== note the use of the hyphen character

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