DKIM is an abbreviation for Domain Key Identified Mail. DKIM is a method of associating a domain name with an email. This helps the recipient mail server identify the record and validate the sender's authenticity.
How does DKIM work?
- You send an email from your Webmail interface
- Your SMTP server that has the authority to send an email on behalf of your domain adds a DKIM signature header to your email and sends it to the destination mail server.
- The destination SMTP receives the email, identifies the DKIM signature in the email, and validates the public signature on your domain using DNS lookup
- If the signature in your email matches the public signature in your email, then the email is termed "Legit"
However, there are various factors that the mail servers consider before allotting a Spam score to the email. This includes the content used in the email such as Spam Trigger words, Weak Headline, or no link to Unsubscribe.
The main advantage of using a DKIM on your email is it helps land your mail in the Inbox.
Return Path Address is an email address where the mail server sends the reports/feedback of the bounced emails. If an outbound email is not delivered, it’ll end up at the Return-Path email address, which is specified by the Return-Path header in an email and invisible to other parties.
It is always advised to set up a custom Return-Path for businesses that rely on email communication with their current and future clients.
With the Return-Path address, the reports for the bounced emails can be managed efficiently as they will not mix up with the legitimate emails you have received from your customers.