I once worked in a shop where Exchange was configured not to send text equivalent with HTML emails. Even messages sent in plain text would be munged by Exchange into unreadable HTML hash. These may in fact be the default settings. I emailed the sysadmin asking that they be changed, and his only response was "Try using an email client from this century."

Mutt is NOT suited for the professional world. The professional world has standardized on Outlook and Exchange. If you use something different, no one is going to change anything for your prima donna ass if your emails turn out unreadable. Use Outlook for your company mail.