In the previous episode (06.02.2002, 16:33:39), Professional Software
Engineering <PSE-L(_at_)mail(_dot_)professional(_dot_)org> said:
At 09:15 2002-02-07 +0900, Nelson Henry Eric did say:
What's the problem? Why does "relay1.rwth-aachen.de" say my domain
does not
resolve? If it doesn't resolve, how can I get the mail back?
There may have been a transient DNS or network problem preventing the
server from resolving your host.
and thus the Aachen mail server sent back a 451 error message:
Diagnostic-Code: SMTP; 451 4.1.8 Domain of sender address
netb(_at_)irm(_dot_)nara(_dot_)kindai(_dot_)ac(_dot_)jp does not resolve
the 4* error codes in SMTP are non-fatal in order to ensure that the
sender will retry later - a temporary DNS failure for example will then
only delay the mail and not have it returned as un-deliverable.
and many (note: not all) sending servers understand those codes and react
accordingly.
hope this lightens things up ;)
wolfgang
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