Am 17.02.2012 18:48, schrieb Simon Hintermann:
> Okay, the webserver is a Plesk server where users can set an email 
> redirection to their external address. I don't
> know why, but many users do that.

i am out here because i never use such software using server
configuartions natevily all of the time and if need/usefull
develop my own webinterfaces

> As I cannot handle these sender rules on every single one Plesk I have (qmail 
> or postfix...), I have to set up a
> mail gateway for outgoing mails. I also have Bluequartz working with 
> sendmail, and Kerio servers, working with
> custom MTAs.

thats the problem with PLESK and "ready" software

in my setups i can enforce psotfix configurations on one
central mysql-database and every single relay on any
webserver is using this tables as need readonly for
enforcing rules

> So, as I understood, correct me if I'm wrong, my email gateway does only see 
> an email going from [email protected] to
> [email protected], none of which are in my local domains.

in your case it may be difficult

in my setup it is easy

* user has a sender-adress to type we are owning, ever
* any host is checking for alloweed senders
* forwarding are only done on the gateway

so the gateway doe snever see any foreign sender for outigoing messages



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