How to add DKIM to your mail server if your mail server doesn't support it?

 DKIM signature

DKIM signature is important and required if you want to deliver emails to gmail or yahoo or apple. Some people are still using on-premesis mail servers that don't support this, and it is not easy to replace it, so, what can you do?

Setting up a SMTP mail relay that signs all outgoing mails

You can setup a SMTP relay to deliver mails from your "existing" smtp server, and signs all out-going mails with DKIM. Let's see what is the quickest way to do it.

Once you configure the SMTP server, make your existing email server to send all emails via evomailserver, don't forget to add security before you launch it, you can use username and password or IP-address restrictions.