* on the Mon, Dec 18, 2006 at 04:56:05PM -0000, Gordon McKee wrote:

> I have an exim front end server and an exchange backend server.  All seems 
> fine except that I can't send emails to users on 123-reg's server.  all 
> messages come back as:
> 
> [EMAIL PROTECTED]
> 
> SMTP error from remote mail server after RCPT 
> TO:<[EMAIL PROTECTED]>:
> 
> host mx0.123-reg.co.uk [195.224.48.120]: 550-Verification failed for 
> <[EMAIL PROTECTED]>
> 
> 550 Sender verify failed

There's nothing there to suggest 123-reg's mx's are doing callouts. It
might be failing because the MX records for optimalprofit.com are:

mail-1.optimalprofit.com
mail-2.optimalprofit.com

These are cnames, yet should be A records.

Just a guess.

Mike

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