Hello, On Thu, 19 Jan 2017 06:30:24 -0500 John C Klensin wrote:
[snip] > > There are also some complex questions as to whether a server is > ever permitted to refuse to accept mail with a backward-pointing > address of "<>". Unless tied to either the identifying > information in EHLO/HELO or the client's IP address, it would > imply that the server never accepts bounce messages or MDNs of > any sort. I have probably missed some cases, but think that > would be a terrible practice and would certainly violate > assorted assumptions of SMTP. > You're missing for example this: http://slett.net/spam-filtering-for-mx/exim-sign.html Which is something we use/offer here. And the client IP address (RBL, locally listed) is another factor. RCPT TO might be ineffective, but I don't see me exposing VRFY/EXPN ever. Christian -- Christian Balzer Network/Systems Engineer ch...@gol.com Global OnLine Japan/Rakuten Communications http://www.gol.com/ -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/