This is my setup
Xperia ZL 4.3 (JB)
Wifi Sharing from Macbook Pro (Maverick)
Connect to Wifi hotspot created from Macbook. AquaMail cannot connect to mail servers (tried Yahoo, Mail.com). Works fine on 3G. All other apps works fine on my phone with this setup.
Let me know if i can so some diagnosis for you to solve the issue.
[Edit] I have sent you a mail with debug logs as well.