A customer needs to send emails from a Programmable Logic Controller (PLC) which cannot provide authentication. The customer’s email server is gmail which obviously requires authentication.

The PLC IP is 192.168.1.2 and the PC IP on which stunnel is installed is 192.168.1.31

My config is:

cert = stunnel.pem

[smtps]

client = yes

accept = 25

connect = smtp.gmail.com:465

The PLC is set up to send emails to the IP of the PC 192.168.1.31

When I try to send emails I get the following in the stunnel log:

2013.06.26 14:26:30 LOG5[12384:13048]: Service [smtps] accepted connection from 192.168.1.2:2938

2013.06.26 14:26:30 LOG5[12384:13048]: connect_blocking: connected 74.125.130.108:465

2013.06.26 14:26:30 LOG5[12384:13048]: Service [smtps] connected remote server from 192.168.1.31:53599

Any help would be greatly appreciated!

Stephen Gates

Harold K. Scholz Company

7800 Serum Avenue

Ralston, NE  68127

402-339-7600