Anyway, I'd recommend you remove your current problematic account and add it again from scratch. To do that you would have to know what type of account you want to add - as explained above.
If you are not sure, would be good to ask the person responsible for the email service in your company to give you specific instructions on how to add the account. You might have to do specific configurations depending on how the Mail Server handles client connections.
onetapu: Not sure what you mean - what kind of account. No, haven't tried removing and putting in settings again.
Is it a POP email account, or IMAP, or Exchange?
onetapu: it's a POP a/c with xtra
Delete the account and try to set up as IMAP: