Hello,
Thank you for your question regarding issues sending, receiving, and logging into webmail. As a test try logging in directly from the server such as:
https://secure221.inmotionhosting.com/webmail
I also recommend reviewing your mail logs for additional clues or record of your connection/login attempts.
If your problems persist I recommend contacting Live Support so they can test with your specific email account.
Thank you,
John-Paul