How To Hack Someones IMVU Without Their Password 2021

This is Version 1.14 (5804), running on macOS 10.15.7, though it has been the case for some time, really.

There's a setting for this in the Composer preferences pane. Is it enabled?

What about “System Preferences > Security & Privacy > Contacts > MailMate”?

Yes. I have Contacts and From Headers ticked.

Also MailMate is ticked in System Preferences > Security & Privacy > Contacts.

Maybe try disabling/enabling the permission in System Preferences.

You can also try launching MailMate like this from a Terminal window:

defaults write com.freron.MailMate MmDebugAddressCompletion -bool YES
/Applications/MailMate.app/Contents/MacOS/MailMate

(This debug variable hasn't been used for a long time, but it should at least show if MailMate attempts to look in Contacts.)

I've disabled and re-enabled the permission, and I've switched on the debugging flag as suggested. I see a fair bit of output in Terminal. How do I know if MM is consulting Contacts? (I'm a little loathe to paste the results here without first editing out the actual email addresses.)

The debug output should at least contain something like:

Find matches for 'xxx' in Contacts

Just to make sure that MailMate tries to look for them.

In general, there isn't a lot of spam on the ticket system, but it seems some tickets somehow become targets for some kind of spamming algorithm. Just ignore them and I'll remove the spam messages when I see them.