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Certain services require a secure connection to be established over SMTPS rather than use STARTTLS to upgrade a connection made over SMTP. Python's smtplib provides classes for managing both kinds of connections, but envelopes only has support for SMTP. I added an extra argument (
smtps
) to the declaration of theConnection
class (defaulting toFalse
), and select between using SMTP and SMTPS based upon its value.