We have a client who is having trouble sending emails to an address. He is receiving fine but when he replys he gets the follow message back:
Your message did not reach some or all of the intended recipients.
Subject: RE: PO #GA1196
Sent: 09/06/2008 10:01
The following recipient(s) could not be reached:
hydro on 09/06/2008 10:01
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<companyX.co.uk #5.5.0 smtp;553 sorry, this recipient is in my badrecipientto list (#5.7.1)>
Is there any way of finding out which server/domain he is being blocked on?