554 5.7.1 Service unavailable; Client host [x.x.x.x] blocked using y.y.y; ?this means the client host is tagged as a spammer in an online spammer database.
if you nonetheless want to send an email to that address, you can remove that online spammer database in your zimbra by:
go to
server > mta > remove y.y.y from RBLs
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