Collective.mockmailhost

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- Nothing changed yet.

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Breaking changes:

- Remove support for Python versions prior to 3.7 and Plone versions
prior to 5.2.
[mamico]

New features:

- Add `messages_from`, and `messages_to` to record senders and recipients.
This is useful for testing `bcc` that is not present in the message.
[mamico]

Bug fixes:

- *add item here*

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Breaking changes:

- Do not depend on old SecureMailHost any longer.
[pbauer]

New features:

- Python 3 support.
[pbauer]

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- Fix import location, Globals has been removed.
[gforcada]

- Rework tests setup.
[gforcada]

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- Fix MIMEText compatibility (broken since 0.9).
[jone]

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- Clean up msg before sending. Otherwise Plone self registration
email does not work [sureshvv]