Thanks for the encouraging insight...

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Len Conrad
Sent: Wednesday, 24 September, 2003 23:07
To: [EMAIL PROTECTED]
Subject: Re: [IMail Forum] Errors 450 / 451



>As of late There have been many instances of the following errors:
>
>451 Domain of sender address [EMAIL PROTECTED] does not resolve    // the
>actual domain has been changed
>450 Unknown host/domain problemdomain

4xx means, probably, the destination MX had a DNS timeout when querying for 
problem domain.  It happens. be patient.  you retry and it DNS answers for 
them next time.

And bet your company on reliable, timely mail delivery.  :))

Len


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