v3.9

• Added a new LOCK_FILE_NAME which lets you change post office's lock file name. Thanks @Mogost!
• Fixes a bug where email_queued signal is not sent in certain cases. Thanks @diesieben07!
• Fixes an issue where attachment admin page would not render with large number of emails. Thanks @petrprikryl!
• Fixes a crash when email instances are made with context, but without a template. Thanks @pacahon!
• Other miscellaneous fixes and house keeping tasks by @Mogost!

v3.7.1

• Optimized a queryset in get_queued() that doesn't use indexes in Postgres. Thanks @marsha97!
• Removed date_hierarchy option which causes admin to load slowly on DBs with a large number of emails. Thanks @selwin!
• Optimized cleanup_expired_mails() so that deletes emails in smaller batches. Thanks @marsha97!

v3.7.0

• Changed JSON columns to use Django's JSONField and drop jsonfield dependency. Thanks @jrief!
• Fixed saving HTML emails that have quoted_printable. Thanks @gabn88!
• Fixes an issue where emails are rendered without context in Django's admin interface. Thanks @zagl!
• This version no longer supports Django 3.1.

v3.6.3

• Fixed an issue where emails may not be rendered with context. Thanks @zagl!
• Fixed a few packaging issues. Thanks @zagl and @adamchainz!
• send_messages() now mimics Django's SMTP Backend return value. Thanks @JiriKr!

v3.6.2

• Improvement to attachment handling in admin interface. Thanks @petrprikryl!
• Fixed a bug where HTML body is not displayed in admin interface. Thanks @robbieadi!
• Explicitly specify default_auto_field to supress migration warnings. Thanks @CirXe0N!
• Fixed a bug where email.template is not saved in certain cases. Thanks @franciscobmacedo!

v3.6.1

• Support for bleach >= 5.0. Thanks @franciscobmacedo!
• Ensure that Reply-To headers are correctly set. Thanks @christophmeissner!
• Add a Resend button in admin to easily resend an email. Thanks @domdinicola!

v3.6.0

• Support for Django 4.0. Thanks @domdinicola!
• cleanup_mail now deletes emails in batches, which is much nicer to DB when deleting millions of emails. Thanks @stevemc4!
• Failure to send an email are now logged as an exception. Thanks @SaturnFromTitan!
• Added es locale. Thanks @ahmontero!
• Fixed admin template discovery issue for case-sensitive filesystems. Thanks @fasih!
• Fixes: SMTPServerDisconnected error. Thanks @weimens!
• Various maintenance work by @jrief and @Mogost.

v3.5.2

• Fixed an issue where Post Office's admin interface doesn't show. Thanks @christianciu!

v3.5.0

• Added the capability to configure retries via MAX_RETRIES and RETRY_INTERVAL configuration settings. Thanks @Houtmann and @jrief!
• The admin interface has been improved to show previews of emails. If you want HTML emails to be rendered,
  please install bleach. Thanks @jrief!
• Add Message-ID to the Email model. This allows administrators to trace back emails. Thanks @jrief!
• Added CELERY_ENABLED settings. Thanks @elineda!
• Fixes an issue that prevents PDS attachments from being sent. Thanks @patroqueeet!