Thunderbird will not allow me to use a group email I have been using for months, why and how do I do it please?

Question

I set up a group email for people that I send an email to at least once a month, I updated Thunderbird when the update came up and now when I have gone to send the email it has told me that it must be in the form of name@host, not my Groups name. How do I fix this problem without having to put each individual email address in each month

Answer 1

This has been reported as [https://bugzilla.mozilla.org/show_bug.cgi?id=1060901 Bug #1060901]. If you have an account on Bugzilla, please consider voting for that issue.
Several other people have sent in the same support request as you, noting this happened after they upgraded to version 31.1.
The exact error message is: XXXX is not a valid e-mail address because it is not of the form user@host. You must correct it before sending the e-mail.
'''This happens when your mailing list description includes several words separated by spaces.'''
Although not ideal, these workarounds should let you use your mailing lists until a proper fix is implemented:
* While composing an email open the address book and select the list you are trying to send to, highlight all the names in the list and drag them to the To: box. This uses your existing data without modifying it.
* Replacing the blanks " " between the words in such lists' descriptions with an underscore "_". This requires modifying your mailing list(s) description(s).