[MlMt] MailMate and Protonmail - Error/Warning

[Benjamin Zimmermann]

Hello,

is anyone using MM with ProtonMail?
I have my ProtonMail - account setup in MailMate, using the 
ProtonBridge.
So far everything was working fine, until yesterday.
When I compose a new message in MM, it takes approx. 20seconds, and then 
I get a popup saying:

IMAP Problem for ProtonMail account
MailMate encountered the following error: Server response: „M6 NO No 
such mailbox“. Command attempted: „M6 SUBSCRIBE Drafts“. Mailbox: 
„Drafts“.

I already checked the subscriptions in my account, and there is indeed 
no Drafts mailbox listed, all the others I can see. I also tried to 
delete and re-adding the account several times, but I get the same 
error/warning every time I am composing a new message. The messages are 
getting sent, as far as I can see.

I was wondering if anyone experienced the same behavior, using this 
setup.

Cheers

Benny