Hi, On Thu, Mar 10, 2022 at 5:23 PM Viktor Dukhovni <postfix-us...@dukhovni.org> wrote: > > > On 10 Mar 2022, at 3:48 pm, Alex <mysqlstud...@gmail.com> wrote: > > > > Can I use sender_checks to bypass a host like mail.coupahost.com? The > > client IP will constantly change, but I can rely on the sending domain > > to remain the same. > > Conditional header checks require a milter or content filter that > can make such fine distinctions. Postfix built-in header checks > are global.
I need to find a way to have different policies for different domains on the same IP address, such as to be able to reject mail from one sender to one domain but accept that sender to another. Are there existing content filters that can do this, or is the process explained somewhere? I've looked at a few examples but these distinctions don't seem to be made. Building a milter from scratch to do this sounds like a daunting process. The milter docs mention it's possible to analyze headers, but don't appear to provide any details on how this would even be done.
