Publishing an MX Record for Amazon SES Email Receiving
A mail exchanger (MX) record is a record on your domain's name server that points to a mail server to handle your domain's email. To specify Amazon SES as your email receiver, you can publish an MX record to point to the Amazon SES email-receiving endpoint for the region you want to use. (For example, the endpoint for US West (Oregon) is inbound-smtp.us-west-2.amazonaws.com.) For a list of Amazon SES endpoints, see Regions and Amazon SES.
Although you are not required to publish an MX record to receive mail through Amazon SES, if you don't publish the record, Amazon SES will receive mail for your domain only if you explicitly route it to Amazon SES.