Email authentication DomainKeys Identified Mail (DKIM).
Email authentication is very important for your brand name from being spoofed or spammed that could damage your reputation.
If a spammer or scammer sent email from a forged mail of your company it will lead damage to the reputation of your company and it is really hard to earn it back.
HOW IT WORKS
Basically, DKIM performs the encryption of the email via private Key and allows to the receiver to decrypt it via public Key: if the hash value matches it’s ok otherwise there is something wrong.
Remember that DKIM signature is something that refers /is chained to a domain, so if you got a generic email (for example servermx.net) you should check if your generic email hosting provider provides this features.
DomainKeys Identified Mail (DKIM) allows senders to associate a domain name with an email message, thus imprinting for its reliability.
This is allowed by “signing” the email with a digital signature, an attribute field that is appended to the message’s header.
A “signature” is made up by the sending mail transfer agent (MTA) via an algorithm, applied to the content of the signed attributes, which creates a unique sequence of characters, a “hash value.”