[stunnel-users] Sending Email from PLC Without Authentication with gmail

[Leandro Avila]

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 at hkscholz.com>
>To: stunnel-users at 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
> 
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