>verify (SAV) is an abusive technique.

to each his own opinion.

>In our imgate server we have "reject_unverified_sender" directive. Is
>it safe deleting this directive?

Count how many SAV rejected yesterday and see if you have other ways 
to stop that traffic:

zegrep -ic "sender address rejected: un(del|ver)" /var/log/maillog.0.gz

SAV should be at the very end of smtpd_recipient_retrictions, so all 
other filters have a chance to reject.

Len






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