“send by amazonses” is added to your outgoing emails when you are sending an email with adding and activating DKIM record to your domain name inside your Amazon SES account.
In order to add DKIM record to your domain name, your verified email which is added in EasySendy Pro and the required domain name should be in same region of Amazon SES.
You can follow the guide from Amazon for adding DKIM easily.
PS: After you have added your DKIM record and it has been verified, then, don’t forget to add.
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