Hi

> One partner we want to send mails to does BOUNCE mails with
> 554 5.7.1 DNS Blacklisted by in-addr.arpa (in reply to MAIL FROM
> command)
> Do you think this is correct?

I talked to the admin of the mailserver and what he is doing is:

host says it is hostname.example.com
spamfilter checkes the MX for example.com
spamfilter does not do any further checks
spamfilter sees hostname.example.com != mail.example.com
=> BOUNCE

:-/

Regards
Sebastian Ries

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