An email has two addresses to indicate its source:
- A From address shown to the message recipient.
- A MAIL FROM address that shows where the message originated.
The MAIL FROM address is sometimes called the Envelope Sender, Envelope From, Bounce Address, or Return Path address. Mail servers use the MAIL FROM address to return bounced messages and other error notifications. Recipients can only view the MAIL FROM address if they view the source code for the message.
The subdomain you use for your MAIL FROM address domain has to meet the following requirements:
- It must be a subdomain of the verified identity (domain) from where you send the email. For example, applaudmail.mycompany.com is a valid MAIL FROM address domain for the domain mycompany.com.
- It shouldn't be a domain you use to receive email.
|"v=spf1 include:amazonses.com ~all"
If you miss setting up the above custom MAIL FROM domain, your recipients will see region.amazonses.com in the originated section of the received email, such as us-west-2.amazonses.com or eu-central-1.amazonses.com.
Take care to use a new subdomain so that you don't replace any existing SPF records for the root domain or other subdomains.