Repoze-sendmail

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- TBD

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- Moved documentation to RTD.

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- Drop support for Python 3.3.

- Add support for Python 3.6.

- Fix parsing of ``debug_smtp`` from queue processor config file: it must
be a boolean, rather than a string, when passed to the stdlib. (issue 40).

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- Drop support for Python 2.6 and 3.2.

- Add support for Python 3.4 and 3.5.

- Add ``ignore_transient`` parameter to ``QueueProcessor``, to prevent raising
temporary errors in some situations. (PR 37)

- Reset 'tpc_phase' to zero during 'tpc_abort' / 'tpc_finish'. (issue 30)

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- Add "savepoint" support to transactional mail integration. (PR 24/28)

- Mail Delivery utilities can now be passed a transaction manager (falling
back to the ''transaction.get()`` default), making it easier to override.
(PR 27)

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- Replace 'utf_8' encoding name with preferred spelling ('utf-8').

- Replace 'latin_1' encoding name with preferred spelling ('iso-8859-1')

- Include the time of the error when logging errors from the queue processor.

- response.MIMEPart now correctly sets the charset of the email payload if it's
one of the content_type parameters of the Message or Attachment.

- The SMTPMailer now accepts an "ssl" argument, which, if passed, will cause
the SMTP factory to return an SMTP_SSL connection instead of a plain old
SMTP connection.

- The SMTPMailer now uses a 10-second timeout by default, used when an
SMTP connection is made but the server does not respond in enough time.