On May 29, 2008, at 11:12 PM, /dev/rob0 wrote:
>> I've read your original message, you indicate the your internet
>> connection was down, and clients sending mails were receiving bounce
>> messages for "Domain not found". That would imply a 550 error, not a
>> 450 error. Temporary issues, as would be the case when your internet
>> connection is down, should give 450s, so it would seem that you have
>> overridden defaults elsewhere, or have other config issues.
> No, it's simply the matter of how a MUA takes rejection versus MTAs.
> Typical MUAs probably cannot distinguish types of rejection. Even a
> temporary error comes right back to the user. At least that's the case
> in kmail. I think the answer to the OP's question is, "No, not
> The workarounds are probably not worth the trouble; either live with
> the occasional problem, or remove the reject_unknown_recipient_domain
My read on what was happening was that his clients (MUAs) were able to
send mail to his server (MTA), but the server had no connection to
deliver further, and bounced back to the clients. Now, if his clients
were trying to reach another server on the internet themselves, and
the internet connection was down, that's a different story.
Pity logs weren't posted... :)