How to solve the problem of mail delivery?

Question

Email

Hello! The third day I'm trying to solve the problem with the delivery of mail to users. 4-5 months ago I set everything up, tests showed 10 out of 10, everything worked. the last month and a half began to notice that many users register on the site, but do not confirm their e-mail. This was confirmed by the letter of one user - letters do not even come in spam!
I checked the DNS settings and made some changes. But tests still show errors, and letters do not reach all users (most often they do not come to Yandex mail, at best they fall into spam).

One of the tests shows the following:



I am attaching a screenshot of the DNS settings. Please, knowledgeable people, tell me what could be wrong? Where is the mistake?

Answer 1

The header of the message that was tested is missing here. Testing shows connection errors to the MX server, but everything is fine with your MX server. Yes, and the DKIM selector should be looked at in the header. You have a DKIM entry, but which DKIM selector is in the message? And are you sure you are sending messages through that IP address and on behalf of the domain whose DNS settings you have applied?