Tutanota returns emails timed out

Emails sent from Tutanota return as “Connection timed out” to all my .com/.co.uk/.com.au domains

Happens on mail hosted by both Tutanota premium and free accounts.

Tutanota help has no response via their stated service.

I’m on the freeby to test but if this is the case not much point.

Anyone else experience this?
Any resolutions?