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 <[email protected]> >To: [email protected] >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 >[email protected] >https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users > > > _______________________________________________ stunnel-users mailing list [email protected] https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users
