Re: [mlmmj] Problem with mail sent by @orange.fr to @protonmail.com

Pierre Cros writes:
>
> It works well even for the pretty bad admin I am. But I don't know where to  
> look to understand the following problem :
>
> • My list works well for all users most of the time
>
> • When a sender uses orange.fr SMTP to send a mail on this list, the  
> subscribers with @protonmail.com adresses won't get the mail at all (not even  
> in the spams), the other subscribers will receive it.
>
> • if some @orange.fr sender, sends a mail directly (without the list) to some  
> @protonmail.com receiver, it works
>
> It looks like mlmmj adds something that will make mails sent by orange.fr  
> unacceptable for @protonmail.com mail serveur.
>

The most common problem is if a list member is sending from a domain that  
exposes SPF/DMARC information.

Relaying such message through mlmmj (and any other mailing list) will retain the sender information - but with a new origin (the mlmmj server)

If the receiving part (protonmail) inspects the SPF/DMARC (supplied by the originating domain) it will propably drop the email or put it in quarantine.

Mlmmj still nedds a proper sender rewriting feature that will rewrite the sender information into something ala "Original sender name via mlmmj-liste-name <[email protected]>"

PS: I'm just guessing about the reasons for your described problem...


/UFfe