Thunderbird locks up with no-reply@mail.newsletter.instructables.com Answered

Re: Email from

no-reply@mail.newsletter.instructables.com

causes my email client (Thunderbird engine) to completely lock up meaning I have to use Windows Task manager to get out of program.

Please see attach screen capture of error message. If I click "O.K.' it just comes back!!!

Windows 7 Pro 64 bit updated
Firefox v55.0.1 64bit
Thunderbird  v52.2.1