mozilla / relman-auto-nag / #4696 / 1

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Ensure SMTP over SSL verifies the server certificate (#2193)

This patch supplies an ssl context to the `SMTP_SSL` constructor, which enables certificate verification. The default context will use the system's trusted CA certificates. See https://docs.python.org/3/library/ssl.html#ssl-security for more.

Kudos to Martin Schobert and Tobias Ospelt of Pentagrid AG for reporting to Mozilla Security.

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