On Tue, 17 Nov 2015 09:46:01 PM Rick Moen via luv-talk wrote:
However, when the mail is relayed through Mailman and redirected out to subscribers' own SMTP hosts, those SMTP hosts will tend to fail the mail on the same tests that it passed on the initial transmission, because a new IP -- LUV's IP -- is now purporting to _also_ be an authorised sender IP for the sender's domain (even though LUV's IP _isn't_ listed in the sending domain's DKIM/DMARC or SPF DNS records).
Russell's solution amounts to 'change the sender upon retransmission to the subscribers'.
List servers ARE changing the sender. Instead of receiving a message directly from the person you receive mail from the list server which has very different issues with anti-spam etc. This list server is also re-encoding the message entirely, for example my MUA doesn't base64 encode the message body but when my mail goes through the list server it is encoded in that way.
Ultimately, LUV either messes with user's mail contents in a fashion that conceals and falsifies the original 'From: ' information the sender specified, with additional damage of sabotaging reply-sender operations, or it doesn't.
I don't believe that it is in any way falsified. The recipient has no doubt about the name of the sender or the fact that the mail came via the list. It's also trivial to discover the email address of the original.
The specific reason I question the necessity is that I'm not seeing all the other mailing lists being driven to this measure. Indeed, I'm not seeing that elsewhere at all, including on the numerous technical mailing lists *I* administer in the San Francisco Bay Area.
The Linux Australia mailing lists have had continual ongoing issues in this regard. The last time I sent mail to the address advertised for contacting the LA council it was rejected because the LA server in question forwards mail to a different server that does SPF checks! The ongoing issue with LA servers is one of the factors that drove my work on the LUV server. Another issue is the fact that I want to sign my own mail. Through 2 different versions of Mailman I have not found another way of making it not break on DKIM signed mail that I send. Finally the world is just going towards DKIM. As much as some people have said that they want to just reject mail from Yahoo etc that's not something that LUV is going to do. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/