I thought I would pass along to all, that if you make use of the reject if the from field is empty, you may end up being blacklisted by verizon.net.  Verizon.net started performing an MTA check on the sending user account sometime in late June 2004, before they accept the message they come back into your mail system to validate the authenticity of the sending account. 

However they use an empty from field when doing this check.  I ended up being blacklisted by verizon for over a month. Also you cannot get in touch with thier internet security group it is very difficult.

To date, they are the only ISP I have seen peform this type of checking.  To get around this, I added their servers that perform this check routine to my DNS/IP white listing.

David here is the link. look at the fax number at the very bottom of the page.  I ended up faxing these every day for two weeks until they responded to me. I made it a point on the fax, to use my companies letter head with all of my contact information.  Once I got some on the phone and over 2-3 days of working with them and myself did we determine that they implemented an MTA check in late june.  here is the link to the support site.  Also, they implemented complete RFC compliance for email, if you are missing anything to do with this, they will also blacklist you.  But keep in mind, they 1st only to do this, if you have been reported to their security group, which puts your domain and IPs on a watchlist, then their auto filters check your site periodicaly for RFC compliance.  In my case it was having the recject if empty mail from.  They claim is allowed because the RFC requires it.

http://www22.verizon.com/customerSupport/contactus/contacts/

Fax: 972-615-4310

I do have a name an contact if you want it, please send along your email address.

thx

jerry

Unfortunately, this is an ooooold issue with Verizon... you may be interested in reading this thread on this board: http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=2665

Verizon's new motto: "Do as we say, not as we do."