My email address is not sending emails...stating that they cannot be sent during IO operations. It is also not allowing me to save as draft so I'm unable to do vital work today. Is there something that I need to do to rectify?

My incoming emails are also being sent to an old email address on Zoho under my maiden name, even though all changes have been made, and these emails are not showing up in the email address with my married name...I'm losing emails this way....and this is only a recent problem. The email address was update when I married over 12months ago and has worked fine until now.