Add potentially useful website that checks how likely your email is to be received to installation docs.

[Dante-De-Gruyter]

I have a proposal,
this website gives you a lot of useful information about the emails sent by your iRedMail installation, and in my case helped me diagnose some DNS record problems.
Would it be a good idea to add a link to this website to some installation docs?

[iredmail]

Is it better developing (by iRedMail team) an online tool to help diagnose DNS records like mail-tester.com? also setup DNS records.

[Dante-De-Gruyter]

If you can create a website to diagnose DNS record problems that sounds like a great idea!

[iredmail]

Working on it.