I found this sales number 888.584.3150 on this link.  Maybe they have the billing number http://www.postini.com/contact/salesform.php

It seems that you have to have a login on their support page to find the billing number.  Good Luck.

Wow - what a joke. I followed that link and first dialed the 888-584-3150 number and was greeted by a recording saying number no longer in service.

Called the 650.216.3574 and was told the new number was 866-767-8461 for US customers. When I called that I get a - No longer in service message. The new number is 866-954-1567. So I called that and was immediately dropped into a queue that played the same orchestra over and over and over ( I know because I sat on speaker phone hold for nearly a hour). From there I returned to the original Postini corporate number of 866-767-8461 and was given another number at the end of the message for a "direct line" to Postini. That number is 512-343-9399, but guess what - no answer there either.. However, no music queues this time, just the forever ring.ring.ring.ring.ring..... Ughh!

I emailed them several times over the past few months with zero response, so I'm not using their forms anymore. I need to get a live, breathing person to speak to me.

Wow, sorry to hear that.  I think they must rely on resellers for support or something.  I wish I had some other info to give you.

Know how to become a reseller?

dsmjeff--I do not usually like to do this but here is the Google list of contacts for Postini. http://www.google.com/search?q=Postini+how+to+contact+billing&sourceid=ie7&rls=com.microsoft:en-us:IE-SearchBox&ie=&oe=
Most solutions are email addresses.  However that may be better than nothing.

Going down the reseller path was the ticket. I have found out how to get back into my account without any Google interaction - pretty ridiculous that I have to become a reseller to get in touch with someone, but oh well.

Thanks to all who helped.