I just figured this out myself in exim4 after a lot of reading about exim configuration. First, you want your app to add the following header: Return-Path: <bounced@yourdomain.com> Works with or without brackets. Exim will add brackets in the end either way. Second, this was the hard part. Exim always wanted to override my Return-Path: … Read more
You should check with SMTP. That means you have to connect to that email’s SMTP server. After connecting to the SMTP server you should send these commands: HELO somehostname.example MAIL FROM: <no-reply@gmail.com> RCPT TO: <emailtovalidate@domain.example> If you get “<emailtovalidate@domain.example> Relay access denied” that means this email is Invalid. There is a simple PHP class. You … Read more
Let’s start with a simple example. Let’s say you have an email list, that is going to send out the following RFC2822 content. From: <coolstuff@mymailinglist.example> To: <you@example.com> Subject: Super simple email Reply-To: <coolstuff-threadId=123@mymailinglist.example> This is a very simple body. Now, let’s say you are going to send it from a mailing list, that implements VERP … Read more