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Regarding on what to do, I’ve got this answer from my domain and mail storage provider:
The domain mail.evgyuru.hu is the MX record of evgyuru.hu.
Setting the 'A' record for this domain is necessary because without it
you will not have an IP address, the mailman will not know where
to deliver and the mail will still not work.
According to the attached image, the setting is not successful because
a NETLIFY record already exists for the domain.
Regarding the nominated records, please consult with the provider
of the name servers, until then it is not recommended to delete them.
I still don’t recieve my e-mails. My email provider wrote the following:
The domain mail.evgyuru.hu is the MX record of evgyuru.hu. This MX record needs an A record.
In practice, other domains can also be set that point to the IP address of your hosting (18.104.22.168). If the domain set as an MX record does not have an IP address (the A record), it will not work with mail, because the sending server will not know to whom it