Email account error on Send/Receive all error

Hey Veera, 

I believe I have seen something like this happen before, it may be an email in their inbox that exceeds perhaps the subject line max character count, or maybe something else. 
One thing you can do to isolate which email it is, is to do the following:

1. Create a custom folder in Outlook 
2. Change the root folder in the Email Account record in Acumatica to the new custom folder you created in step 1 
3. Move emails into the custom root folder in batches (10/20/30 at a time, whatever you prefer)
4. After each batch, click “Receive” on the email account in Acumatica, if doing this in batches it should sync the first batch immediately, if it does not then that first batch has the email that is causing issues within it 
5. If the first batch syncs properly, continue to move the next batch, so on and so forth, until you find a batch that includes the email causing issues 
6. Once the email is isolated and has been found, move all email back into the inbox except for the one causing the issues, and change the root folder in Acumatica back to inbox 
7. Analyze the email causing the issue outside of the inbox to determine if the length of subject line or something else is causing an issue