I have a problem sending mail from a customer's domain back to mine.
Customer's domain = epmcevilly.co.uk (BT as service provider, ClaraNet as domain host)
My domain = converged-solutions.com (BT as service provider, 1and1 as domain host (unfortunately))
Mail from EPMcEvilly destined for converged-solutions.com is bouncing back with the following message:-
The following recipient(s) could not be reached:
email@example.com on 04/05/2006 13:20
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<convergerged-solutions.com #5.5.0 smtp;550-Verification failed for <PeterJefferies@epmcevilly.co.uk>>
I have looked at similar posts but cant resolve this one. I'm a relative novice at this. I'm using SBS2003 and Exchange at both sites. My firewall is a SonicWallTZ170 and EPMcEvilly have a BT Voyager2110. The client can mail everyone but converged-solutions.com (me).
Have tried multiple SMTP servers and combinations of DNS servers with no joy (some different error messages but no success).
Bit confused and unsure of how to check 'mx' records and 'reverse DNS' entries.
I have set the question as 500pts simply because the client is jumping all over me to get this sorted.
Any help would be much appreciated...Thank you