How to track conversions from the mailing list by criteria?

Question

gmail

Good day!
Tell me, is it possible to track the e-mail from which the transition from the mailing list was made?

Answer 1

It is better not to do mailings from ordinary mailboxes, there are specialized services.
It is necessary to stick a unique link in each letter. Third-party services usually have the appropriate option - they replace the links in the letter template with their page with subsequent redirection.

Answer 2

Yes. Include a key (user_id) in the link that you can use to match the email.

Answer 3

The mailing is made from the e-mail service.
There is a unique marker in the letter (I use it to track conversions from e-mail), but the problem is that it turns out to track only the fact of conversion from e-mail.
The essence of the question is how to track the specific address from which the transition occurred? or is it impossible?