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Next MX never used when best MX says 520




I can't get mail delivered to a specific domain.  The messages just
stay in the queue.

DNS says
  domain    MX   0  host1
  domain    MX   10 host2

host1 says
  520 Connection not authorised from this address.

qmail connects to host1 and says
  deferral: Connected_to_N.N.N.N_but_greeting_failed./... 

qmail seemingly never tries host2.

The administrators of domain says
  - this setup is intentional (sort of firewall/spam control)
  - why isn't your mailer using the second-best MX?
  - others have reported this too.  They use qmail too.

What's wrong here?  The error code?  qmail?

Mads