Well, I'm sorry, but what kind of response were you expecting?
The server administrator disabled your account's sending function, intentionally or not, but it's blocked at the server (at least via EWS).
You've already confirmed this with another mail app, which is completely unrelated to Aqua.
Were you expecting me to make my app somehow go around this server side policy? A hack of some sort? A security vulnerability exploit?
Would your IT department be happy if they found out? Getting you fired and getting me sued or my app removed from Google Play?
Or were you expecting some kind of magic? Unicorns with roses sticking out of their asses?
I mean, seriously?