Mail Checker does not work

First of all: fantastic work and thanks a lot!

Unfortunately, the mail checker does not work for me though.

I am using the same email address to send and check for tickets.
The sending works but the checking of mail does not.

Error log:

{"level":"error","message":"Address in use, exiting...","timestamp":"2021-10-16T11:25:11.623Z"}
{"level":"error","message":"Address in use, exiting...","timestamp":"2021-10-16T11:25:11.918Z"}
{"level":"error","message":"Address in use, exiting...","timestamp":"2021-10-16T11:25:12.162Z"}
{"level":"error","message":"Address in use, exiting...","timestamp":"2021-10-16T11:25:12.651Z"}

Any idea what I can do?

Thanks a lot!

I just noticed that the mails are deleted from the server but no ticket is created.

I have also noticed this. There were a few suggestions i read here that kind of got it going by modifying some code, but then i noticed that an email with an inline image would come through, be deleted and not create a ticket. I was able to get HTML formatted text-only emails to create tickets.