[MlMt] "(No Correspondent)"

[Sam Hathaway]

Hi folks,

I recently started a MailMate install from scratch (after removing MM 
prefs and App Support directory) due to extreme app slowness after 
having changed email providers.

The slowness is gone, but now I’m seeing “(No Correspondent)” in 
the Correspondents column for some messages. If I quit and re-open MM it 
goes away (the real correspondents are shown) but later “(No 
Correspondent)” will show up on some other message.

Occasionally all messages in a mailbox will show “(No 
Correspondent)”.

What does this mean?

I’m using MailMate 1.9.7 (5419) on macOS 10.12.6 (16G29) with a 
FastMail IMAP account.

Thanks!
-sam