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
Stephen, "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 issue with your situation is not stunnel but the fact that your SMTP client does not have the capability to provide authentication. As you mentioned, Gmail will require authentication information from the client. If that information is not provided by the SMTP client application, then the SMTP transaction will fail. I would suggest you consider setting up some kind of SMTP Relay. Which will serve as a proxy between your PLC and Google SMTP servers. You can also take a look at this document and if possible implement the last approach http://support.google.com/a/bin/answer.py?hl=en&answer=176600 Regards.
----------------- Leandro Avila
From: Stephen Gates sgates@hkscholz.com To: stunnel-users@stunnel.org Sent: Wednesday, June 26, 2013 2:25 PM Subject: [stunnel-users] Sending Email from PLC Without Authentication with gmail
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 _______________________________________________ stunnel-users mailing list stunnel-users@stunnel.org https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users
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Leandro Avila -
Stephen Gates