Greetings, While I was updating/cleaning up the whole configuration of an email server I must manage (see the other message I posted here yesterday from my main address) another issue came up.
The first help I'd need is help with terminology: my main problem may be the simple fact that I don't know, or forgot, what the RIGHT name of the function below is, and consequently don't recognize the right documentation. Thanks in advance for any pointer. Here is the issue. The SPF and DKIM configuration of that server as the MTA for its domain, example.com, is almost finished. Now, if someuser sends email through my postfix 1) as "From: someu...@example.com" 2) as "From: someu...@someotherdomain.com" obviously, email of type (1) will pass all SPF and DKIM checks performed at destination, email of type (2) won't. Of course, someuser could connect directly to the MTA of someotherdomain.com when he needs to use that account. But for several reasons, we (including someuser!) would really, really prefer to avoid that. So, a) is it possible to tell postfix at example.com that all and only the email from someuser with a From: address of someu...@someotherdomain.com should be relayed through that MTA, not directly to destination? (I am almost sure it is, as I said my first problem is to know/use the right search terms for this function, sorry) b) would it work, as far as SPF and DKIM are concerned? Would it cause other problems? Thanks, Marco
