GMAIL as SMTP guide

docs/SMTP_GMAIL.md

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+## Use the Gmail SMTP server
+    
+1) Create an app password by following the instructions from Google, you need to Enable 2FA for this to work.
+[https://support.google.com/accounts/answer/185833](https://support.google.com/accounts/answer/185833)
+
+2) Specify the following settings:
+
+```python
+    SMTP_SKIP_TLS=True
+    SMTP_FORCE_SSL=True 
+    SMTP_PORT=465
+    SMTP_SERVER='smtp.gmail.com'
+    SMTP_PASS='16-digit passcode from google'
+```
+