Can't use cyrillic symbols in sender argument

[cyxou]

Hi, when I try to use my name written in Russian (using cyrillic symbols) like this:
postman -sender "Александр <alex@mycompany.ru>", I get this kind of error:

Error sending email: mail: missing word in phrase: mail: invalid string

Same error happens when I try to use square brackets:
[MyCompanyName] Alexander <alex@mycompany.ru>

[zachlatta]

@clmoreno: interested in taking this?

[clmoreno]

@zachlatta Sure, i will check it

[pepa65]

I would think that this now works OK with updated Go. At least, it works for Thai script in the sender line.