Follow these step to add a new mailer :

Click on "Apps" from the left side menu, then click on "Gateways".

Click on the "+" icon to add a new Mailer.

Choose one of the Mailers (SendGrid, MailGun, Amazon SES) and enter your mailer details. then click on "+ Add".

Once added, You will need to verify the Mailers to be able to send emails.

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