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I think if you set your domain as custom domain with big provider and set DNS entries you will have much better results.

But for personal mail it feels like waste of money instead of just using one of big providers domain directly.

It won't feel that way anymore when the big provider is closed or kicks you off because of another glitch in one of its anti-fraud systems which nobody seems to fully understand.

Are you sure you were informed by Thunderbird and not by your SMTP server?

It was most certainly due to the SMTP server doing retries with backoffs.

I had a similar issue with .dev tld and getting emails from Walmart.

Why would you think it was a good idea to use a non professional email address when job hunting?

A comedian, or morse code enthusiast?

Because I'm stupid!