SMTP (Simple Mail Transfer Protocol) is an Internet protocol for transferring e-mail messages from a sender (e.g. a NETIO device) to a mail server (SMTP server) and then further on, up to the recipient’s server (the end user then downloads the message using e.g. POP3 or IMAP protocols).
![NETIO intelligent power strips support SMTP protocol Email alerts are possible to set in networked power sockets NETIO](https://www.netio-products.com/files/styles/glossary_552x414/public/Glossary_E-mail-notification_1104.png?itok=IfyxHIFi)
Unencrypted SMTP protocol uses port 25; however, the unencrypted version is practically unusable nowadays.
In the context of NETIO products
NETIO 4x products support encrypted TLS (SSL) connection (if enabled in the configuration); however, the port needs to be specified after the mail server address, separated with a colon. For example: smtp.seznam.cz:465
- SMTP port 25 (unencrypted connection)
- SMTP port 465 / port 587 / port 2525 (SSL encrypted connection)
Note: E-mails can be sent from Lua scripts. When the SMTP server is unavailable, e-mails may be lost.
Tip: AN03 Power socket 230V switch OFF when current over limit, emails