You are great. You inspired me to search. I found the issue and fixed as per below article. Thanks a lot dear…
http://linuxpitstop.com/install-ssmtp-to-send-emails-to-gmail-and-office3655/
That’s great that you solved it and I’m glad I could inspire your desire to want to fix it by yourself. Enjoy your gsm enabled FreePBX system 
This usually means your trunk config is not recognizing the dongle trunk.
Also, you should run the inbound call through a sanitizer (like “from-pstn-e164-us”) to get rid of the “+” on the front of the DID. This may also help.
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