What are DKIM and Return Path records? Why do I need them?

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?

1. You send an email from your Webmail interface
   
2. 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.
   
3. The destination SMTP receives the email, identifies the DKIM signature in the email, and validates the public signature on your domain using DNS lookup
   
4. 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.