Using the string "linux-arm-kernel@lists.infradead.org" followed by multiple spaces as a name in the To/CC list leads to the closing quote being escaped: "linux-arm-kernel@lists.infradead.org\"
Which in turn leads to invalid address rejected by mailing lists / servers etc.

It happens regardless of the mail address, so for instance:
To: "linux-arm-kernel@lists.infradead.org"                    <your@address.com>
will also get mis-escaped (making this problem very easy to repro).

It does _not_ happen when there's only one space between closing " and <, so this:
To: "linux-arm-kernel@lists.infradead.org" <your@address.com>
seems to work just fine.