From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Schmidt Date: Thu, 10 Jul 2014 07:54:01 +0000 Subject: Re: [mlmmj] Allowing empty enevelope senders Message-Id: <53BE4699.4000709@yahoo.com.au> List-Id: References: <3154844.GYFGS8R0Q3@storm> In-Reply-To: <3154844.GYFGS8R0Q3@storm> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: mlmmj@mlmmj.org On 8/07/14 6:59 PM, Thomas Jarosch wrote: > I've found a good description why an empty envelope is a valid thing > according to RFC 821, page 15: > http://marc.merlins.org/netrants/nullenvelope.txt That link correctly identifies empty envelope senders as used for bounce messages. Furthermore, as you've identified, the mails are being discarded by Mlmmj, not the mail server. The mail server accepts them, meeting the requirements of the RFC and the document above. Mlmmj discards them, because they should not be delivered to the mailing list. If they are getting to that point in Mlmmj, it probably means VERP is not working/misconfigured, because bounce messages should come back to listname+bounces and get handled by mlmmj-bounce so bouncing users are automatically unsubscribed (which helps prevent your mail server getting blacklisted, among other things). Ben.