The mailing list for listmasters using Sympa

[Radu Vatav <address@concealed>]

Thank you all for the answers!

I upgraded, put 'dmarc_protection_mod all' in sympa.conf and it works as 
I wanted.

Radu


On 27.01.2015 10:39, Steve Shipway (via sympa-users Mailing List) wrote:
> This is because Yahoo (and some others) now advertise a strict DMARC policy, 
> which specifies that the From address should be validated against SPF.  Since 
> this fails (due to the list redirection) the message is dropped.
>
> This is a problem because DMARC does not take into account the 'secretary 
> scenario', of which a mailing list is a particular use case (imagine a 
> secretary sending an email on behalf of her boss; she is the Sender, but the 
> message is From the boss).  Ironically, Sympa is strictly RFC822 (SMTP) 
> compliant, which states that the From header must state the originator and 
> the Sender header gives the message sender if different; but SPF and DMARC 
> ignore Sender and assume From is the Sender, meaning it is impossible to be 
> simultaneously compliant to both standards.
>
> The solution is to munge the From address so that it no longer causes a DMARC 
> check, either by setting the 'anonymous' option on the list so that 'From' is 
> always set to some address you own, or else using the DMARC patch that was 
> added after v6.1.22.  The DMARC patch allows Sympa to detect if a strict 
> DMARC policy is in effect for the sender domain, and if so, munges the From 
> address while preserving the Friendly Name.
>
> There was extensive discussion on many fora last year complaining about the 
> broken DMARC standard and the strict implementation used by Yahoo, AOL and 
> others causing all mailing lists to break; however the only thing to do is to 
> work around it as with this patch.
>
> TL;DR -- use DMARC protection in Sympa 6.1.22 or later.
>
> Steve
>
> Steve Shipway
> University of Auckland ITS
> UNIX Systems Design Lead
> address@concealed
> Ph: +64 9 373 7599 ext 86487
>
>
> ________________________________________
> From: address@concealed 
> [address@concealed] on behalf of Radu Vatav 
> [address@concealed]
> Sent: Tuesday, 27 January 2015 3:55 a.m.
> To: address@concealed
> Subject: [sympa-users] how to distribute with list address in "From:" and original 
> sender in "Reply-to"?
>
> Hello,
>
> yahoo changed policy and is not accepting mails with "From: "
> someone@some_domain and delivery from another_domain. See here:
>
> http://postmaster.yahoo.com/errors/postmaster-28.html
>
> The only way I found that works is setting the list address as
> anonymous_sender, but information about original sender is lost. Yahoo
> suggests setting the original sender as "Reply-to" but I haven't managed
> to do so in sympa.
>
> I tried remove_headers with reply_to_header and some other combinations
> I don't remember, the point is, if I remove the "From" field, it's lost
> forever.
>
> Any tips on how to do this?
>
> Best regards,
> Radu Vatav