[Alpine-info] Question for List Administrator

[Carlos E. R. via Alpine-info]

On 2024-07-20 23:09, Bret Busby via Alpine-info wrote:

> On 21/7/24 04:41, Bret Busby via Alpine-info wrote:

>> On 21/7/24 04:15, James Miller via Alpine-info wrote:

> 

> Why has the mailing list administration been changed to conceal the 

> email address of posters?

> 

> Is that to prohibit subscribers from directly contacting a poster of a 

> message, in response to content of a post, and, to prohibit subscribers 

> from blocking email from a particular poster, if a poster shows 

> delinquent behaviour?

> 

> This change to the mailing list administration is ominous.


This is because mail having the poster email, but being actually sent by 
a list server break security features such as DKIM-Signature, dmarc,  or 
others (I don't remember which one, exactly), but make the receiving 
mail server reject the mail as if forged or manipulated in transit.

Thus the list mail server has to change the "From" line and add a new 
Reply-To:

From: Bret Busby via Alpine-info <alpine-info at u.washington.edu>
Reply-To: Bret Busby <...>

Ie, if doing it the traditional way the receiving servers see that the 
post is coming from u.washington.edu but have a from address 
someone.com, which they consider invalid and reject the email. That's 
hundreds of rejects and mail users angry because their mail is not 
received by subscribers. It is a consequence of the fight on spam.


This is happening on several mail lists. Some do it only for some 
domains, some do it for everybody.

This can not be avoided.


I had this explained by an admin on another mail list, but I can not 
locate his post with the correct explanation. What I wrote is from memory.

Oh, found it (the short version):

«It is called "DMARC mitigation".  We do that for sending domains with
DMARC policies.»

Well, u.washington.edu seems to be doing it for everybody.



-- 
Cheers / Saludos,

		Carlos E. R.
		(from 15.5 x86_64 at Telcontar)

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