Is DKIM a must?

Is DKIM a must?

Like what is explained in DKIM.org, DomainKeys Identified Mail (DKIM) enables an organization to take responsibility for an email sent.  The organization is a handler of the message, either as its originator or as an intermediary. Their reputation is the basis for evaluating whether to trust the message for further handlings, such as delivery. Technically DKIM provides a method for validating a domain name identity that is associated with a message through cryptographic authentication.

DKIM works only from the originator email server. Most modern email servers allow you to enable and sign each outgoing email. The administrator is responsible to add the DKIM key as a text file into the domain DNS record. If the DKIM keys match, the email is genuinely sent from the originator’s email server. This helps to fight spam emails and enhanced email delivery. But wait a minute…

Provided the recipients’ email servers are checking on DKIM. Yes, google email gateways do but I have seen many others don’t. So, my question is if you do not enable DKIM, does it mean you cannot send outgoing emails. The answer is ‘NO’. Apparently, even you do not have DKIM you can still send to Gmail users or any recipients email servers checking n DKIM. So, the purpose of DKIM only enhances its delivery if your recipient email servers are checking on DKIM. But this is how I look at, DKIM is good to enable if users are told to send their emails via a designated email server but definitely not a must at least for now.