mikel/mail — comment on commit 3deb69264ad676a6110a6b7ed6195040db4fe684
File:  line 0
By monde:

yes, I get the "IOError in 'Mail::Multibyte::Chars downcase should convert characters in the string to lowercase'" error as well. I think its a activesupport dependency so I just changed my code to not downcase on a header I was inspecting. I didn't have the time to roll up my sleeves and resolve or fix the issue myself.

My spec run was thus:
Finished in 8.35798 seconds
1293 examples, 2 failures, 8 pending