Authentication is a way to prove an email isn't forged. SPF and DKIM are most common used  authentication methods.

SPF (Sender Policy Framework) is a way for email service providers to verify that a mail server is authorized to send email for a domain.

DKIM is an authentication protocol that is used by email receivers to determine if an email message was sent by who it says it was sent by.  DKIM often improves deliverability of emails to the inbox since a receiver can be confident that the message is not a forgery.


You will need access to your DNS server to make these updates or you will need access to a hosting panel that has access to edit your DNS records.  

Step 1: DKIM (Create a TXT record )
         
Record Type:TXT
HOST: em._domainkey
TXT VALUE: v=DKIM1; g=*; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC75RQss0FsR1dIiQ8fJwD8RJlktEdllRbjHKZcMv8GBnCSqoyNzjuoA6Xn3sJkIw6ZR9eB4hiz1yEdJSVsQKnOCzfLfPFqFbC5z6fBNJ6h/JNHNkcRTaiSwQXxvtP4jpBRbzOoK8rxSDwvPITLhh63xgXomiGYmaMsWkIvVfBnhQIDAQAB 

Step 2: SPF
         
If you don't have SPF records for your domain, then Create a TXT record
Record Type:TXT
HOST: @
TXT VALUE: v=spf1 include:spf1-srvs.em01.net ~all  
   
Note: If you already have SPF record just add "include:spf1-srvs.em01.net" to existing SPF record.

Example: Lets say you have the folowing SPF record:   v=spf1 +a +mx +ip4:122.133.144.155 include:spf.test.com ~all
           
After adding "include:spf1-srvs.em01.net" to existing SPF record you should have
               
v=spf1 +a +mx +ip4:122.133.144.155 include:spf.test.com include:spf1-srvs.em01.net ~all
 
Step 3:  Add from address - In the panel Click preferences< select from address < add your from address > confirm your email address - an email confirmation will be sent
 
Step 4:  Add email address in reply to address  - In the panel Click preferences< select reply to > add your email > confirm your email address - an email confirmation will be sent.
 
NOTE:  After you update your SPF you should wait 24 hours before sending due to DNS propagation.

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