Stratus Magento 2 Guides - Send store mail via SMTP
While this works fine in most cases, we do recommend using an SMTP module or plugin for either version of Magento to improve deliverability. Especially for high traffic stores. Sending a lot of emails daily runs the risk of having the server blocked by the major email providers such as Gmail or Hotmail due to volume. Sending out through dedicated services like Mandrill or Sendgrid allows the sending of higher volumes without the risk of blacklisting.
Magento 1 SMTP
Magento 2 SMTP
Currently, we do not have direct experience with a particular SMTP plugin for Magento 2. There are several available and even one specifically for Sendgrid. Two are listed below which are free. Unfortunately, we cannot guarantee their reliability, however.
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