Will setting a response to an address in another domain in spam

Question

I am sending transactional letters from my application on behalf of my clients. I would like the recipient to be able to click on the answer and respond directly to my client without touching my server.

If I send an email from [e-mail] with a response header to [e-mail] , will my transactional emails be marked as spam? Is this even the slightest red flag for spam filters? It is very important that my emails do not fall into the spam folder, and I spent a lot of time for my email to be sent properly, so I just want to be sure before implementing something like that. Or is this a fairly common practice that I should not worry about?

Answer 1

I could find the answer elsewhere http://www.quora.com/Does-sending-emails-with-a-From-address-with-a-different-domain-from-the-Reply-To-address-hurt -ones-deliverability

Apparently, the response header can be set to another domain without any threat to email delivery. On some of the smaller mail administrators, this can cause a problem, but from a technical point of view it is completely legal.

Answer 2

If your sender address is correctly set and matches your DKIM / SPF DNS records, you are correct that the response should not adversely affect the reputation of your sender.

But ultimately this is a provider level solution, so YMMV for different inbox providers.