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I would like to forward messages to external email addresses and apply sender rewriting. I don't have any experience with this, and was wondering what a default best practice is.I don't know what the best practice is per se. But I'm doing sender rewriting (SRS) on my two public facing Sendmail systems.
- on the mx server I want to decide what messages are for local delivery and what go to external.I'm going to assume that you have an email route (mailertable?) for things going to LOCAL and a fall back smart host configuration going to OUTGOING.
Normally I have to first relay the message to a local host, where in the virtualuser table I have an entry to deliver to an email address.Please elaborate on what you are doing today.
I prefer to skip this. What could I use on the MX host? LDAPRoute?
- I prefer the messages to be routed via the 'OUTGOING' serviceI don't see any problem with sending all messages leaving your environment via OUTGOING. I'd have to look up to see which is the better way to do that; fall back smart host or smart host or something else.
Because the MX are not specified in spf records. Assuming that such envolopes 'SRS0=HHH=TT=example.org=alice@example.com' are still being checked on spf.
- on the 'OUTGOING' I only have dkim signingYou could apply the same type of sender rewriting that I'm doing on your OUTGOING host. Assuming that there is exceedingly little that is delivered locally while everything else is going off host.
I guess best would be to first do some routing and then on the 'OUTGOING' do the sender rewriting. Anyone already doing something like this?
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