Siemens SIMATIC S7-1500 Function Manual page 112

Application example
This application example (https://support.industry.siemens.com/cs/ww/en/view/46817803)
show how you can use the CP of an S7-1500 or S7-1200 station to set up a secure
connection to an email server and send an email with the default application "TMAIL_C" from
the S7 CPU.
Additional information
You can find more information about the system data types TMail_V4_SEC and
TMAIL_QDN_SEC in the STEP 7 online help.
For additional information on secure communication, refer to the section Secure
Communication (Page 34).
Communication
Function Manual, 11/2019, A5E03735815-AH
Open User Communication
6.11 Secure Open User Communication
111