This one I just came across and it's very informative about the mechanics of email.
https://www.learndmarc.com/
I have also used this one in the past and it works well:
https://www.mail-tester.com/
Informative email testing tool
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thecoalman
- Community Team Member
- Posts: 6410
- Joined: Wed Dec 22, 2004 3:52 am
- Location: Pennsylvania, U.S.A.
Informative email testing tool
“Results! Why, man, I have gotten a lot of results! I have found several thousand things that won’t work.”
Attributed - Thomas Edison
Attributed - Thomas Edison
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SpIdErPiGgY
- Registered User
- Posts: 302
- Joined: Sun May 02, 2021 2:11 pm
- Location: Erpe-Mere, Aalst, BE
- Name: Andy Dm
Re: Informative email testing tool
10/10 with mail tester 
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2002XterraSC
- Registered User
- Posts: 17
- Joined: Mon Apr 04, 2022 7:29 pm
- Location: Ontario, Canada
- Name: Adam Z
Re: Informative email testing tool
These are great tools, use them all the time at work as a mail server admin.
Just yesterday I was able to determine a web developer removed a client's DKIM record causing their DMARC to fail.
Just yesterday I was able to determine a web developer removed a client's DKIM record causing their DMARC to fail.
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thecoalman
- Community Team Member
- Posts: 6410
- Joined: Wed Dec 22, 2004 3:52 am
- Location: Pennsylvania, U.S.A.
Re: Informative email testing tool
Another quick tip. If you have gmail account while viewing an email click the three dots in upper right corner. Select "show original".
SPF: PASS with IP <your IP> Learn more
DKIM: 'PASS' with domain yourdoamin.com Learn more
DMARC: 'PASS' Learn more
“Results! Why, man, I have gotten a lot of results! I have found several thousand things that won’t work.”
Attributed - Thomas Edison
Attributed - Thomas Edison