Is a header widely supported for email clients

Question

If I add a response header to the letters that I send, which distinguishes them from the address, it will always work for my users no matter which client they use.

I have had situations where replies are sent to the from address instead of the reply address.

Answer 1

It’s hard to answer. There is no strict rule that customers must comply with the Reply-To header. This is all RFC 2822 says on this subject (section 3.6.2):

, . "Reply-To:" , (), . "Reply-To:", (), ":", , .

"". , Reply-To , From.

, RFC 2119:

"" , , , .

, , , , , - . , Reply-To, , .