I have to congratulate the k9 team. Superb piece of app which I have been using for years in mission critical applications and which has never let me down. the push feature using IMAP is the best I have used surpassing the blackberry by far.
One problem which arose in the last few months (using Huawei Mate pro 20) is that when a contact is chosen whilst writing an email, it crashes, sometimes the same contact causes it to crash repetitively.
Taking this opportunity to suggest perhaps a feature where the emails are colour tagged depending on the recipient domain if anyone has the time to work this out.
Again congratulations to the team for a job very well done !!!