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Cannot send mail to a mail server using postini

I have and exchange 2003 SBS server and it has problems sending email to a server that uses postini.  I am not familiar with postini and unless you one of their customers, getting information from them is difficult.   I have checked the ip address of my exchange server on dnsstuff and it shows that I am not blacklisted anywhere.  What in postini then is preventing me from sending mail to it.

As always any help is  greatly appreciated.
1 Solution
Most likely the reverse lookup records for your domain do not exist,
or they resolve to your provider instead of to yourself.

You could check this with a trick.
If you instruct your mailserver to deliver all outgoing mail NOT directly to the addressee's mailserver, but instead deliver it to your provider's SMTP server... smtp.provider.com  or mail.provider.com or relay.provider.com

Then, most likely, the mails will be accepted.

Sounds like postini is doing what the client is paying it to do, but as with all of these types of solutions some legitimate customers will get caught.

As already said, make sure that you're reverse DNS entries are correct. You may also be blocked if you are on a DSL or other dynamic IP connection.

Check how your domain is currently setup with dnsreport.com
Check your IP address for blacklists to see if the IP address is listed: http://rbls.org/

The way round it is to use an SMTP Connector. This lets you route emails for domains protected by postini via your ISP.
My web site at http://www.amset.info/exchange/smtp-connector.asp has more information on setting one up.

Exchange MVP.

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