There are a few checks that are up to the domain holder to complete when configuring a mail service. You’ll want to complete things like SFP, DKIM, and DMARC records on your domain which are systems that work with your mail provider to prove that you are really who you say you are and not a spoofed email which physically cannot do this. If a site like EPIC checks for DKIM records on setting up an account, then this is in fact something you can configure and is generally free to do.
There are a few checks that are up to the domain holder to complete when configuring a mail service. You’ll want to complete things like SFP, DKIM, and DMARC records on your domain which are systems that work with your mail provider to prove that you are really who you say you are and not a spoofed email which physically cannot do this. If a site like EPIC checks for DKIM records on setting up an account, then this is in fact something you can configure and is generally free to do.