I am highly frustrated with Apple Mail these days.
All the desperately waited features in Apple Mail are somehow broken.

1. SENT LATER
I was desperately waiting for this, but it is so broken.

Emails that are scheduled for later can’t be changed! You see them, you can re-schedule them, but you can’t edit them.

Emails that are sent on a schedule are not ending up in SENT ITEMS.

2. GPG/PGP
Still only available with a 3rd party app.

3. S/MIME
Still broken sometimes. Self-send emails are not being verified and it shows a broken S/MIME certificate.

4. Link Preview
Breaks other email clients and chops off part of the message. Literally everything below the link. Thanks…