<p>For me in mail gem 2.7.0 it works if I disable the condition of <a href="https://github.com/mikel/mail/blob/master/lib/mail/field.rb#L133">https://github.com/mikel/mail/blob/master/lib/mail/field.rb#L133</a> this check was introduced with 2.7.0.rc2 by <a href="https://github.com/mikel/mail/commit/c0662469a2be815ace17c18962bf02bef6a3474c#diff-480c9cbc16ce0b8fb4b396b9f46187f6" class="commit-link">mikel/mail@<tt>c066246</tt>#diff-480c9cbc16ce0b8fb4b396b9f46187f6</a></p>

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