Only rewrite external forwards / differentiate between local and external domains

[RedJohn14]

Hello Support,

I tested now 3 days to get postsrsd worked with my postfix, nothing will work fine. I want to differentiate between local and external domains for the postsrsd. I have the following system:

1. I have some Gateway for SPAM, this gateway relay to the Postfix Server (with postsrsd) in the backend
2. The Postfix Server have some MySQL lookups for the virtual mailboxes and domains
3. If someone send out some e-mail the Postfix backend Server make the SQL lookups and the Postfix backend Server send the E-Mail out on self.

Now I have the following problem, I create some forwarding e.g. mydomain.de to gmail.com. If I send now some E-Mail to mydomain.de the E-Mails is correctly forwarded to gmail.com with SRS, GREAT so far!

BUT if I now write some E-Mail from mydomain.de to e.g. mypersonaldomain.de (this domains is also on my Postfix Server) postsrsd REWRITE this email. Is there any solution to disable this? I have also tested this here:
#76

But after the changes in master.cf my Postfix Server is down. I have also installed amavisd on the Postfix Server but I think this is not the problem? Only if I added the "sender_canonical_maps=mysql:/etc/postfix/mysql_virtual_local_email.cf" to my master.cf the Postfix Server have the problems.

My second problem is if I write an email from a backend Mailserver who is relaying over my Postfix Server, postsrsd also rewrite the address. e.g. email from mypersonaldomain.de to gmail.com. But this email from my backend mailserver who relayed over Postfix it not a forwarding and I don't need postsrsd at this case.

In this case my Mailserver relaying over the Postfix (with postsrsd) and the Postfix (with postsrsd) send the email out to gmail.com BUT with postsrsd.

I like postsrsd really, because I need it on my mailserver I have several forward email addresses to gmail.com but how we can differentiate between local and external domains? Any idea or anything what we can do?

I have also see this in my log file, but this is for some INCOMMING email which was relayed and delivered internal. My Postfix Server relay this E-Mail to some internal server e.g. Exchange Server. Which some MySQL maybe I can solve this problem. So postsrsd knows if it is needed or not ?

postsrsd[10041]: srs_forward: <externalsender@domain.de> rewritten as <SRS0=5589=458=domain.de=externalsender@srs.mydomain.de>

At the moment all E-Mails that come to my Postfix Server touched by postsrsd. I have also tested:

SRS_EXCLUDE_DOMAINS=

And this is my Postfix main.cf config:

recipient_canonical_maps=tcp:localhost:10002
sender_canonical_maps=tcp:127.0.0.1:10001
sender_canonical_classes = envelope_sender
recipient_canonical_classes= envelope_recipient

Hope for any idea that would be so nice!

Regards,

Oliver

[renky]

nearly 3 months over, and no ideas out there... I have exactly the same issue - I already used postsrsd in the past, for several months but I had problems with some Sieve-Rules because of the unnecessary rewritten emailadresses... In the end I had to disable it on most of my servers, since I really didn't find a solution... Few days ago I restartet the effort, but I came to the same unhappy ending as last time: My knowledge seems not to be enough to get it running...

I also figured out: with the default-settings (no backend mailserver - only a single mailserver) also sent mails to external domains are rewritten.

I also tried it with SRS_EXCLUDE_DOMAINS= - that was stupid - it exactly worked the way vice versa: only outgoing mails have been rewritten, but no forwarded Mails, because the To-Address was an exluded domain... but neighter local delivered nor locally forwarded mails (external or internal target). And even if there would be an "INCLUDE_DOMAINS" function it wouldn't work - because it cannot differentiate beween ingoing and outgoing mails...

postforward would be an alternative, like it is mentioned in the known issues - but honestly - it's an ugly installation and it's an ugly configuration and yeah, using pipe-transport seems also to be ugly to me... I like the way postsrsd works in total.

This exactly same discussion can be found over and over again in different boards and in different toolings that use postfix...

What I don't understand: is there noone out there who found a solution and want's to share it? And if there is a solution by postfix-configuration - please add it to the config info of postsrsd... I always think "hey, there must be an idea how we can use a mysql-query to set or not set sender_canonical_maps"... What I'm dreaming about is kind of an mysql-query, that queries an empty string (default value of sender_canonical_maps is empty) if a domain is known, and the necessary config "tcp:localhost:10001" in all other cases... this one I guess could even be figured out by me - but I fear, it wouldn't solve the problem that sent emails are also rewritten, also if it isn't a forward...

What I had the most execations in, is the regex-solution in #76 - but I didn't get it working... First issue is: i use amavisd that is already using 10025 and 10027 - if i integrate it, there is a problem with the content-filter that is empty in my configuration - so i tried another port like 10029 additionally, but it NEVER rewrote anything....
I guess, that the regex doesn't fit - /^srs=.@.$/ smtp:127.0.0.1:10027
if i search my rewritten mails, first SRS is written upper case, and second, there is never an = following srs - my mails look like this: SRS0=5LSh=AS=domain.de=user@mail.server.de
so it is SRS0= - not srs=
is that the reason? should it be changed, and if yes, how to integrate with amavis?

Other Idea: multi-postfix - why not? one instance that accepts mails from outside, checks for forwarding - nothing else, does srs if outgoing forward, in all other cases, forward to next postfix-instance and there everything is like now... why not? Could be an additional configuration idea for postsrsd - just run it in a separated postfix-instance... but - how to configure?

What I understand is:
postfix developer doesn't want to integrade srs in the postfix core - that's his good right to say, broken by design - althoug all the big providers enforce it - if i want to use forwardings, that are on my server and forward mails from outside to outside - I NEED SRS and since I'm only a small light in the univers, I have to follow the "rules" that the big players tell us...
I guess, there are hundreds of other people who has the same issue...

I hope anybody finds a solution or can go on with my thoughs and bring it to life, and then comes back and shares his solution with us...

Thanks in advance

[dandju]

Did you manage to find a solution by chance? Struggling with this too.

[benchonaut]

Got it working

#76 (comment)