User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:37.0) Gecko/20100101 Firefox/37.0 Build ID: 20150415140819 Steps to reproduce: RFC5322, Section 3.4 defines 'Group Addresses' as group = display-name ":" [group-list] ";" [CFWS] These may be empty (again, as intended by the RFC!) Examples are undisclosed-recipients, etc, which may appear in a received email if eg the sender CC's the email to a group that is invisible to the sender. Actual results: Thunderbird unhelpfully does not recognize such an empty group address when using the 'Reply-All' function, and keeps that group-address in the CC: header, which makes the MTA the mail is submitted to throw an error, so that one has to manually remove this group-address. Expected results: Thunderbird should recognize such empty group-addresses and perform either one of these functions: ignore such group-addresses which have on group-list [optionally] look up the name of such a group-address in the locak user's addressbook and substitute the members's addresses (this must be configurable, as it is likely to fail/be the wrong thing to do in many cases) other?
Summary: fix handling of Group Addresses → fix handling of Group Addresses defined by ; semicolon per RFC5322
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