Can't send mail on Android 6.0.1 using Zoho Mail servers

[snafu_]

I just installed the latest Aqua Mail app on my Oneplus 3 phone that's running Marshmallow 6.0.1
I setup my account using the "Internet" option for an IMAP server. I enter in Zoho's published IMAP server settings with the correct names and security protocols and everthing seems to go okay in Aqua Mail. When I start the app, I see all of my email in the inbox and other folders. So, something is causing an issue with SMTP.
 Even when I enter the SMTP settings during the account setup, it passes the quick test and the setup procedure goes on to the next step.
However, if I try to send an email I get a popup stating there was an "error submitting the message" and nothing is sent out.

I know that the server names, login name, password, etc are all correct as I have successfully used the same settings in other email applications. I have also tried various combinations of ports and SSL/TLS and logon protocols. Nothing I do gets Aqua Mail to be able to send. 

I like this email client and would really like to get it to work. Anyone been able to get this to work with the Zoho servers?

[snafu_]

Thanks for your reply.
But, I've tried that smtp configuration (among many others) and I still get the "error submitting message" when trying to send an email.
WiFi or 4G - it doesn't matter, still no luck.

I've used the Zoho app and also Touchdown and Bluemail (all on Android) and of course Outlook 2010 on the PC. Of all the Android apps, I like the Aqua Mail UI the best, but it's the one that refuses to work with ZoHo. Aqua Mail works fine on my phone with Gmail.

Can I ask what you have set for authentication under the smtp settings? Though I have tried them all.
Also what version of Android are you using? I'm beginning to think it may be a bug with 6.0.1
I'm also thinking that maybe there's an issue with Aqua Mail's setting for where it stores sent mail. I have two folders - "Sent" and "Sent Items". If there's a setting for this in Aqua Mail, I can't find it.
Oh, and are you using the "Pro" version? I'm using the free version until I can get this working

[snafu_]

I got it to work 
I have 2 addresses with Zoho. When I switched to the 2nd account it works fine. I'm fine with using this 2nd account, so I'm good to go.

Thanks again for your help, and sorry I wasted your time 

[Kostya Vasilyev]

Re:
I have 2 addresses with Zoho. When I switched to the 2nd account it works fine. I'm fine with using this 2nd account, so I'm good to go.

Sounds like a settings issue, or maybe one of those accounts needs special settings, or is an alias (not a real account).

Does not sound like an AquaMail issue.

But if you'd like to diagnose further:

- The draft folder's message list should have a more detailed message, in red, below the draft which failed to send.

- And/or you can capture the issue in the app's debug log, this is linked below (in my signature).