I was noticing delays in retrieving emails, even when my email app on my Android phone was set to grab them every 15 minutes.  Turns out there is a feature in newer versions of Android that will "optimize" your battery by restricting programs' ability to use the data connection in the background.  Basically, despite telling your email app to fetch new messages every X minutes, the device is not allowing it to do just that.

There are 2 settings of interest around this, the Battery Saver mode and the Battery Optimization settings.

Battery Saver is something that the user can activate manually to reduce battery consumption when needed, and also automatically activates when the battery is at a critical level, perhaps 10%, 5%, or another preset level.  Battery Saver, among other things, will turn off the background data of most apps.

Battery Optimization is a separate setting that the device automatically turns on for some (most?) apps.  It applies the same background data restrictions as Battery Saver mode, but is active all the time, regardless of how much battery is available!  To review the list of apps that are being "optimize", and to disable this feature for your email app, click on the Battery Optimization selection in the Battery Saver menu.

MRSware email can be set to automatically check the spelling in a message before sending it.  To enable this option, select the Tools menu and Always Check Spelling before Sending when creating a new email.  The option will remain enabled until unchecked by the User.