[Pymilter] use py-milter to change the routing of a Mail

[Gerhard Schmidt]

Am 06.08.2018 um 15:44 schrieb Stuart Gathman:
> Sendmail routing is controlled by mailertable.db (and SMTP AUTH
> passwords are stored in authinfo.db), and mailertable.db can be updated
> without restarting sendmail.  In most distros,  mailertable.db is
> writable only by root - but one solution is to make it writable by your
> milter.  I am assuming that you have a huge database of clients, with
> authorized MTA configured for each client - and therefore cannot easily
> use the mailertable and authinfo tables for sendmail as a static
> configuration.
> 
> I believe you are correct in that I am not aware of any milter api
> substitute for mailertable/authinfo.  You could also update
> mailertable.db/authinfo.db whenever you update the corresponding record
> in your client database, but you probably have many MTAs, and therefore
> want to do it only when actually sending an email for a client.  Hence,
> doing it from milter is the optimum time to do it.

Mailertable is for routing based on to: not on from:

I'm trying to send a mail with a from: uuuu at xyz.com to the smarthost
that is allowd to send @xyz.com mails regardless of the destination
(to:) address. mails from vvvv at zyx.com will be routed over an different
mailserver that is allowed to send mails for @zyx.com regardless about
the destination of the Mail and so on.

Regards
   Estartu



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