I was forced to send an early update mail for the month due to an issue with the email sync service. I had to explain the situation, apologise and explain actions that have been taken to prevent reoccurrence.
Sent emails from Slack are now synced to the mailbox's sent folder so that makes up for some good "new feature" news.
Due to restrictions on Slack, I have been thinking of a mobile/web app that users can use instead. This will really allow more UI/UX flexibility. I don't want to make any rushed decisions though so I included a Typeform survey in the mail to find out what users think. Fingers crossed.