The Postini feature is called "Null Sender Disposition" and is a feature and that can be enabled/disabled at will. It is intended as one of the ways to combat the NDRs generated by spammers forging your e-mail addresses. Depending on what class of service the company is using (through a reseller or directly from Postini) it may not be able to be managed by them directly. However, they could have just recently turned it on because of those NDRs.
Description of the feature from Postini: Choose where to send messages that do not have an SMTP (envelope) sender address. These messages are usually non-delivery reports (NDRs). From: Wulff Jr, Ronald J. [mailto:[email protected]] Sent: Wednesday, July 08, 2009 1:44 PM To: MS-Exchange Admin Issues Subject: RE: Postini blocking based on ENV sender field being blank Oddly enough, we seem to have figured this out. It seems that when some of our DL's were created, they were checked to "Not send delivery reports" That was blanking out the return path on the messages, and just leaving the from field populated. Postini must have recently changed something to start causing us issues as these have been like this for years, but at least now we can fix it on our side Ronald Wulff Jr 412.288.3601 [email protected] Reed Smith LLP 20 Stanwix St Suite 1200 Pittsburgh, PA 15222 From: Wulff Jr, Ronald J. [mailto:[email protected]] Sent: Wednesday, July 08, 2009 10:21 AM To: MS-Exchange Admin Issues Subject: RE: Postini blocking based on ENV sender field being blank LOL, that may be worth a try Ronald Wulff Jr 412.288.3601 [email protected] Reed Smith LLP 20 Stanwix St Suite 1200 Pittsburgh, PA 15222 From: Campbell, Rob [mailto:[email protected]] Sent: Wednesday, July 08, 2009 10:17 AM To: MS-Exchange Admin Issues Subject: RE: Postini blocking based on ENV sender field being blank You could try asking for the log entry and see if they send you the headers. ________________________________ From: Wulff Jr, Ronald J. [mailto:[email protected]] Sent: Wednesday, July 08, 2009 9:13 AM To: MS-Exchange Admin Issues Subject: RE: Postini blocking based on ENV sender field being blank We tried that too, but they sent us back this. We are now waiting for a tech to contact us again >From Postini exprod8mx271.postini.com:2009/07/07 14:36:25 IP:199.125.201.23 SID:c77dc9170386697d To:[email protected] u207275662:i100008522 To:[email protected] u204931628:i100008522 To:[email protected] u205218651:i100008522 To:[email protected] u200772404:i100008522 Header:1264 Size:6883 virus:4(0) Disp:q{nullsend},q{nullsend},q{nullsend},q{nullsend} Ronald Wulff Jr 412.288.3601 [email protected] Reed Smith LLP 20 Stanwix St Suite 1200 Pittsburgh, PA 15222 From: Campbell, Rob [mailto:[email protected]] Sent: Wednesday, July 08, 2009 10:10 AM To: MS-Exchange Admin Issues Subject: RE: Postini blocking based on ENV sender field being blank Then Postini is accepting the emails, and then dropping them. Ask them if they can give you one of the dropped emails, and check the headers against one that went through. ________________________________ From: Wulff Jr, Ronald J. [mailto:[email protected]] Sent: Wednesday, July 08, 2009 9:08 AM To: MS-Exchange Admin Issues Subject: RE: Postini blocking based on ENV sender field being blank Nope, we get nothing back. In fact, we didn't even know there was an issue until one of the recipients called our user because they never received the message Ronald Wulff Jr 412.288.3601 [email protected] Reed Smith LLP 20 Stanwix St Suite 1200 Pittsburgh, PA 15222 From: Campbell, Rob [mailto:[email protected]] Sent: Wednesday, July 08, 2009 10:06 AM To: MS-Exchange Admin Issues Subject: RE: Postini blocking based on ENV sender field being blank Are you getting an NDR from Postini? ________________________________ From: Wulff Jr, Ronald J. [mailto:[email protected]] Sent: Wednesday, July 08, 2009 9:02 AM To: MS-Exchange Admin Issues Subject: Postini blocking based on ENV sender field being blank Recently we have run into an issue with Postini, and as always, their support staff seems to be lacking in explaining what is going on, so I turn to you fine people. We have some DL's setup in our Exchange/AD organization that have external contacts in them When we send to these DL's, and recipients who use Postini as a service are not getting our messages. Postini says that the messages are coming across with no Envelope Sender information. These messages are being sent via Outlook 2003. >From my understanding, a message has both an Envelope sender, and a "from" address, which can vary. However, I am not certain why one of these addresses would be getting removed when using these DL's, as we can email the recipients on a one off basis with zero issues. Anyone have any thoughts? thanks Ronald Wulff Jr 412.288.3601 [email protected] Reed Smith LLP 20 Stanwix St Suite 1200 Pittsburgh, PA 15222 * * * This E-mail, along with any attachments, is considered confidential and may well be legally privileged. If you have received it in error, you are on notice of its status. Please notify us immediately by reply e-mail and then delete this message from your system. Please do not copy it or use it for any purposes, or disclose its contents to any other person. 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