As you know, Our newsletter/greeting emailing software support to create Gmail account directly, so you do not need to remember or refer to any related information about Gmail SMTP settings.
But to send email in our newsletter/greeting emailing software by using Gmail, you must enable the SMTP functionality in Gmail first.
To enable the SMTP functionality in Gmail, just enable the POP functionality.
Please refer to the following FAQ to enable it if you have not done yet.
This article is applied to AMS Birthday/File/Standard Edition.