Exchange 2003 SP2
Can anyone explain what the following error in my exchange app log is caused by?
Event ID: 7004 Source: MSExchangeTransport
This is an SMTP protocol error log for virtual server ID 1, connection #1657. The remote host "18.104.22.168", responded to the SMTP command "rcpt" with "550 MTA inaccessible for too long for domain:reputationsuk.com - psmtp ". The full command sent was "RCPT TO:@reputationsuk.com> ". This will probably cause the connection to fail.
This is the only reciepient I'm having email delivery issues with. Maybe they are blocking our domain on their side? I've checked my domain and we are not on any Blacklists......