Apple Mail suddenly refuses to send from one particular address

tr556fvbnb wrote:

Catalina v10.15.2 Mail v13.0

This one has got me stumped.

One of my (non iCloud) email addresses has after many years stopped sending.

This is where it gets weird though - it appears to be sent by showing up in sent box of Mail, in webmail and in an alternative email client (Airmail 5). Trouble is it never shows up at the destination and I don't get a bounce message either.

Weirder still if I send test email from Airmail 5 or webmail then everything works fine, including being delivered to my inbox in Mail.

I have tried all of tried following without joy:

Verified all correct server/security/password settings with domain host Hostgator

Disabled antivirus

Tried alternative laptop running earlier OS an Mail version

Deleted preferences file

Deleted account an re added

Googled it to death but can't find any other info.

Tried alternate mail client and webmail - this works so I do have a work around but I'm tearing my hair out tying to think why.

Have tried Hostgator support but as soon as I mentioned that the problem only occurred in Apple Mail of course they said that the problem wasn't theirs.

Maybe shifting domains is the answer but before I do I wanted to see if any one out there can think of anything else.

Best,

Richard

Did you use the Connection Doctor>Select the problem account>Show Details

Use Connection Doctor in Mail on Mac - Apple Support

If no server issues on Hostgator side...

In an effort to sort problem account—you delete the Mail Account and add it back in. IMAP stays on the server, POP is deleted from the server—therefore if you want to save your email, move it to a folder you create in the "On My Mac" section to transfer.

Add or remove email accounts in Mail on Mac - Apple Support