Trying to login using email.mydomain.com, it redirects to the webmail workspace site but whenever I try to login I get the error message: "Authentication failed. You entered an incorrect username or password." - I've double checked that the email and password are correct and I'm able to use thunderbird to send/receive emails without an issue, however, I would really like to have the webmail working. (It will work fine if I am to log into the webmail through the cpanel)
I'm sorry you are having issues logging into your webmail. From the sound of it, you do not have workspace email, but are using c-panel email which is a different platform for email. You can use either one of these URLs to log in if you are using C-panel email.
http://your domain name/webmail
http://webmail.your domain name
If you are using workspace email I would suggest using this URL email.secureserver.net
Also, here is a link if you need any more information on cpanel email login.
I am unable to see my mails in webmail. I can send the mail, but if someone sends me the mail, I can't see it in the Inbox. This is causing a lot of problem. Please suggest in this regard. additionally you have removed your online chat also, which was giving us quick solution.
Please resolve this issue at your earliest. I am looking forward hearing from you.