I am? I guess you got the wrong addon then, an outdated/old one?
Here is the actual "Postmaster Mail" addon, last updated (Version 4.1.6 @PacificOshie 2023-08-21), which must be used as a base for the addon please!
https://www.esoui.com/downloads/info...asterMail.html
With the following authors:
Reach out to PacificOshie please if you want to have something added.