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Mail bounce while send groupmail using listserv( mass mailing)



Hii all,

i am new to zimbra. i am using zimbra 6.0 open source. i am facing issue of mail bounce while send it in group using listserv. from last few months it was working fine.while other mails transaction are ok.

I have checked logs too but not found much more. it shows postfix/error 22520.

kindly plz help me.


What do the log files actually say, where you found that Postfix error?

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