Sounds like there is an extra "tab" or "carriage return" getting parsed in there somewhere with your device. Your keyboard app may be sending it, and not Aqua Mail. This may be why it is a frustrating bug to reveal. I have full confidence that Kostya can fix it, if you can narrow it down with more details. Give him your keyboard app nam, any background apps you have, expecially antivirus and malware scanners, also give him the specific device make, model, revision, and Android version.
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