SMTP communication problem

[Jeffatsc]

I have a simple small Windows 2003 domain. An active directory domain server
and a 2003 Exchange server. Installed pretty straightforward. No extra
configuration. We've been running about a month and now a couple of users are
starting to report SMTP communication problem with the recipients email
server #5.50 smtp;550 Invalid recipient and an occassional You do not have
permission to send to this recipient. We use a third party SPAM filtering
service that all the email goes thru. Our MX records are with them. Any help
would be greatly appreciated!

[Leif Pedersen [MVP]]

Hi,

You need to investigate whether the problems lies within the exchange server
or with the spam filtering company. The NDR might tell you this.

Leif

Post by Jeffatsc
I have a simple small Windows 2003 domain. An active directory domain server
and a 2003 Exchange server. Installed pretty straightforward. No extra
configuration. We've been running about a month and now a couple of users are
starting to report SMTP communication problem with the recipients email
server #5.50 smtp;550 Invalid recipient and an occassional You do not have
permission to send to this recipient. We use a third party SPAM filtering
service that all the email goes thru. Our MX records are with them. Any help
would be greatly appreciated!