IOS 16 email problem

[cologne2792]

Since upgrading to IOS 16 on my iPhone 13 it's developed a strange email issue.

When sending an email to an address ending in .co.uk or .com, all is normal.

However, emails sent to .sch.uk simply vanish.

They're not in Sent, Drafts, Junk, Bin or Archive - no record of them exists on the phone at all.

A look in the Drafts folder shows 53 emails now labeled No Recipient and just a few as a normal draft.

Messages sent to .sch.uk from my PC using the same account are delivered with no problem and show in my phone's Sent folder as normal.

I've tried removing and the re-adding the account but the problem persists.

Has anyone encountered this and arrived at a fix?

[SteveKTMer]

If you've got private relay on try turning it off in Apple ID, iCloud.

[somouk]

Just to confirm, are you using the main 'Mail' app on the phone? Not a 3rd party app?

Does it matter what network you are on when you send the emails? If you view the drafts on a normal machine via webmail is the recipient visible then?