Matthias Haeker schreef:
MDeferred: 450 4.1.0 <someone(_at_)xxx-yyy(_dot_)de>: Sender address rejected:
unverified address: Address verification in progress
or:
MDeferred: 450 <anybody(_at_)world(_dot_)de>: Recipient address rejected:
Greylisted for 300 seconds
Before you ask such a question, try google: deferred 450 greylisted
seconds
SMTP error 450 is "Requested mail action not taken: mailbox
unavailable".
Your mail server is expected to wait for at least 300 seconds (5
minutes) before retrying. That it should do by itself, such standard
behaviour should not need any action by you.
Normally an SMTP-server would not retry that soon, see RFC 2821:
http://www.faqs.org/rfcs/rfc2821.html
"In general, the retry interval SHOULD be at
least 30 minutes; however, more sophisticated and variable strategies
will be beneficial when the SMTP client can determine the reason for
non-delivery."
Older MS Exchange servers are known to have the bad habit to retry too
fast.
--
Grtz, Ruud
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