There is a lot of things that can happen:
- the sender may be blacklisted (i.e. sending IP-address is
automatically rejected)
- reverse DNS lookup does not work (i.e. symbolical name does not match
IP address)
- no or incorrect SPF-entry (sender policy framework)
- other local filters may interpret mail as spam and reject..
and some more...
sending and receiving emails can get quite complex...
Best regards
Mike
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