[teddyh]

Just off the top of my head, I would suggest using the “Test your email” tool at <https://internet.nl/> for testing incoming e-mail, and <https://www.learndmarc.com/> and <https://www.mail-tester.com/> for testing sending e-mail.

[mjl-]

I would also suggest https://www.email-security-scans.org/ for testing outgoing emails.

[teddyh]

Others for testing outgoing e-mail which I have saved, but don’t regularly use:

• <https://www.checktls.com/TestReceiver>

• <https://www.helloinbox.email/>

• <http://isnotspam.com/>