Direct feedback can be sent to mm-info@freron.com or you can use the “Help ▸ Send Feedback” menu item within MailMate. Please note that you will not always get a reply since MailMate is being developed by a single individual with natural time constraints. You are welcome to forward your issue again if you do not get a reply within a reasonable time frame and you have not been able to resolve the issue yourself.
There’s an old issue tracker which you can try searching for known issues. It’s possible to create new tickets, but direct feedback as described above is preferred. For now, the ticket system is mainly kept online because it contains answers to some common questions/issues.
You can also join the mailing list by using the form below. Answers may come quicker on the mailing list since other users might provide them. There’s also a searchable archive.
Note: Do not use a Gmail or iCloud email address for the mailing list if you have an alternative option. In the past, these big (and free) email providers have had a very low tolerance for allowing emails from the mailing list. Worst case scenario, you won’t be receiving emails and you’ll be automatically unsubscribed after a while. Check the archive if you worry about having missed anything.