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this post was submitted on 26 Apr 2026
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The problem with tools like this is that they don't actually check that the mail is sent correctly. You can define security keys, but they don't mean anything if your mail server doesn't use them correctly.
For testing, I use https://www.mail-tester.com/ which you send an email to and it does more thorough tests on the server and email itself.
Yeah and I'm not seeing any mention of blocklist checking. I was sending email for months with no issue then the ISP apparently updated their PBL.