Hey. Thanks for taking the time to look at my problem:

I'm trying to blacklist a user on our domain sending to a specific email address (So: user@domain.com -> user@otherdomain.com), I want to get that specific with the blocking. Is there a way to do it with Postfix?

I found this article: Postfix blacklist or reject an email address which I haven't tried to implement yet but I'm going to assume that it is a global block and it will stop emails from *@domain.com -> user@otherdomain.com.

Thanks for any help that is offered!