On Fri, Jan 26, 2007 at 05:38:29PM -0000, Gordon McKee wrote:
> 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

You're missing the fact that when that server relays the message over to
you, it changes the RCPT TO:.

% swaks -s mail-1.optimalprofit.com -q RCPT -f '<>' -t '[EMAIL PROTECTED]'
=== Trying mail-1.optimalprofit.com:25...
=== Connected to mail-1.optimalprofit.com.
<-  220 kursk.gdmckee.home ESMTP Exim 4.66 Sat, 27 Jan 2007 12:35:33 +0000
 -> EHLO foo
<-  250-kursk.gdmckee.home Hello foo [1.2.3.4]
<-  250-SIZE 52428800
<-  250-PIPELINING
<-  250 HELP
 -> MAIL FROM:<>
<-  250 OK
 -> RCPT TO:<[EMAIL PROTECTED]>
<** 550 relay not permitted
 -> QUIT
<-  221 kursk.gdmckee.home closing connection

You need to make your server accept [EMAIL PROTECTED],
or most probably accept helpwhenyouneedit.com as a local domain.

-- 
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