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Need help configuring POSTINI and MX Records to work with hosted POP Mail

I have installed POSTINI SPAM filtering service for a number of clients running Exchange.  I decided to do the same for my small office.  4 POP mailboxes.

Problem is every ISP I've tried is expecting my domain MX record to point to their server, which is not how POSTINI works.  My MX Records points to POSTINI which then sends my EMail to a hostname.

Does anyone know of a way around this or an ISP that will support this environment?

2 Solutions
Mike ThomasConsultantCommented:
I use mesage labs but it should work the same and afaik has nothing to do with your ISP.

Anyone sending you email should look you up via your MX record, this should point to the address that your smart host gave you (in your case POSTINI) your smart host will then send email to your mail server using the external IP address of the your network which you should have given them and they should have tested.

NEMCAuthor Commented:
MojoTech, thanks for your reply.

I'll restate the problem and then the solution I'm ultimately going to use.

MX has to point to POSTINI's hosts.

Earthlink, GoDaddy & Network Solutions are unable to host (POP3) mailboxes for my domain unless the MX points directly to them.  Probably the most obvious demonstration came from Network Solutions.  When I sent mail to my mailboxes hosted by NS, I received an immediate bounce that they woould not relay mail.  Why, because when POSTINI forwarded messages to Network Solutions, they looked up my MX record on the incoming mail and determined it should be sent (back) to POSTINI . . . .ie relaying.

Earthklink business hosting USED to work, but they recently upgraded their servers and it all broke.

My soilution, which I was unaware was an option, will be to have a POSTINI affiliate, Excel Micro host my mail.

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