Thank you

Afaik SRS involves modifying the envelope, and set the return-path to an address that will pass SPF validation, though in order for possible bounces to arrive to the original sender, the address contained within the original return-path is encoded into the new address (and translated back if a bounce occurs). This can be done at the MTA level for postfix with e.g postsrsd but that's usually domain-level forwards (i.e all mails for domain A are forwarded to domain B). It would have been convenient if there were a way to do that with dovecot so as to have SRS compliant redirects (if a particular user wants all his email temporarily redirected to gmail for example). The problem I guess is it can't be just be implemented at the sieve level: even if the envelope could be modified from sieve (which I'm not sure it can, the envelope plugin just provides way to read the envelope), the rewritten address wouldn't be recognized by the MTA when a bounce occurs, the MTA as to be SRS aware anyway. One workaround I can think of would be to use a specific domain (or sub domain) for the rewritten addresses, and a catch-all account with a sieve rule that would check if it's a valid SRS address and translate it back so as to reinject the bounce to the MTA queue so that it reaches the original sender. I'm probably overlooking some possible problems with that though

-----Message d'origine----- De : Matt Pallissard [mailto:matt@pallissard.net] Envoyé : vendredi 1 mai 2020 15:29 À : Mathieu Gosset Cc : dovecot@dovecot.org Objet : Re: sender rewriting scheme

Isn't SRS just mucking around with the headers?

If you're doing this globally, you'll likely want to handle it at the MTA.

However, if you'd like individual users to be able to set it up on their own, you can probably handle that in sieve. Sieve supports modifying the headers.

https://doc.dovecot.org/configuration_manual/sieve/configuring_auto_forward_ sender_address/

Someone else on this list may know better than I.

Matt Pallissard

On 2020-04-30T17:50:37 +0200, Mathieu Gosset wrote:

Hello,

I would like to know if dovecot/pigeonhole provide a way to do sieve redirection with sender rewriting scheme (srs)?

I apologize in advance if that e-mail address isn't meant for assistance, but I've asked on the official irc channel on freenode and was told to direct my query to dovecot@dovecot.org, I hope you won't mind.

Thanking you in advance

Best Regards

Mathieu Gosset