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cjlocy

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There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.

This is the exact error I am getting:

 There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
  <smtp.comcast.net #5.5.0 smtp;550-67.190.*.* blocked by ldap:ou=rblmx,dc=comcast,dc=net>

The problem is I can send email to some outside sites like my gmail account and some other ones but when I try to send to my work email address or comcast address I get the system failure. If someone could walk me through the steps on getting this fixed it would be worth 500 points to them.

Thank you.
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Exchange_Admin

The answer is in the error you posted:
smtp.comcast.net #5.5.0 smtp;550-67.190.*.* blocked by ldap:ou=rblmx,dc=comcast,dc=net

The destination server probably uses a list to block certain IP address ranges.

If you have a DSL connection to the internet then your IP address may be in this range. Most of these lists include DSL IP addresses because they may be in a range of known dynamic IP's. They feel that if someone has a dynamic IP they are more than likely to be a home based customer.

The way around this is to create an SMTPO connector to handle problem domains like this. The connector will be configured to deliver to a smarthost. The smarthost will be the SMTP server of your ISP.

A fellow contributor here created this link:
http://www.amset.info/exchange/smtp-connector.asp
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Sembee
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ASKER

Can you tell me Exchange_Admin how I go about doing what you are saying? I am new to exchange and like to configure it right.

Thank you

Read the link that both Sembee and I posted. Sembee has provided the complete steps.