References: <loom.20151113t203945-...@post.gmane.org>, <20151113221430.GV4773@geta>, <564683bf.1050...@meetinghouse.net>
>>>On Fri, 13 Nov 2015 19:41:14 +0000 (UTC), I wrote: >>> >>> Almost five years ago, I became unable to post questions here by e-mail. The >>> e-mail bounces with, for example: >>> >>> > The following message to <debian-user@lists.debian.org> was undeliverable. >>> > The reason for the problem: >>> > 5.1.0 - Unknown address error 550-'5.1.7 >>> <prvs=752320ad2=sk...@syrano.acb.uc.edu>: Sender address rejected: >>> undeliverable address: host syrano.acb.uc.edu[129.137.3.161] said: 550 5.1.1 >>> <prvs=752320ad2=sk...@syrano.acb.uc.edu>... User unknown (in reply to RCPT >>> TO comm >>> > ... >> On Fri, 13 Nov 2015 16:14:30 -0600, Don Armstrong replied: >> >> This is because you are not supporting sender callback verification; the >> envelope from that you are using needs to be an address which can be >> received. If not, it's not valid. >> >> See https://en.wikipedia.org/wiki/Callback_verification for details > And on Fri, 13 Nov 2015 19:43:43 -0500, Miles Fidelman wrote: > > Well the solution is to have a talk with the mail system admin who > reconfigured the mail system, and did a half-assed job of it. Any idea whether this can be fixed at my local mail server (mailto/sendmail) or whether it has to come from my employer's router? And any idea why no one but the debian lists bounces my e-mails? Is this a level of verification that almost no one else uses? Thanks.