Question about setting up MX Records on Mailgun

I have a quick question about MX records for DNS verification in Mailgun. Will not having the MX records set on our DNS settings prevent some users from receiving activation emails? I’ve had a couple of users over the year, not get the activation email and just want to verify this before asking the guy who handles our DNS settings to update a few records.

Here is the Github issue regarding the problem:
https://github.com/mypaint/mypaint.github.io/issues/31

This is covered in great detail elsewhere, use https://www.mail-tester.com and verify everything is correct.

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Thank you, that gave me the information I needed.