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!