ZyXEL Communications VPN Series Handbook page 759

How to setup Email to SMS
The Email to SMS function can help to send the SMS to client. The SMS
message is initialed from device to SMS provider, and then SMS provider
send the SMS to client. This function can help to make sure user receives
SMS if client without Internet connection.
You can follow these steps to Email to SMS.
Setup SMTP function on your device
Go to CONFIGURATION > System > Notification > Mail Server Field your SMTP serve
configuration.
A. Mail server
B. Mail server ports
C. Mail From
D. SMTP Authentication
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