[BUG] git send-email: incorrectly parses email address with comma

Git send-email allows to combine multiple email addresses in one parameter, e.g.

--to="a@example.com, b@example.com"

But email addresses may contain commas themselves:

--to="LASTNAME, firstname <firstname.lastname@example.com>"

This may lead to an error: $ git send-email --to="Schuchardt, Heinrich <xypron.glpk@example.com>" \ 0000*.patch0000-cover-letter.patch (mbox) Adding cc: Heinrich Schuchardt <xypron.glpk@example.com> from line 'From: Heinrich Schuchardt <xypron.glpk@example.com>'

From: Heinrich Schuchardt <xypron.glpk@example.com>
To: Schuchardt,
        Heinrich <xypron.glpk@example.com>
Subject: [PATCH 0/2] efi_loader: adjust definitions of variable services
Date: Sat, 12 May 2018 10:01:21 +0200
Message-Id: <20180512080121.26620-1-xypron.glpk@example.com>
X-Mailer: git-send-email 2.17.0

Send this email? ([y]es|[n]o|[q]uit|[a]ll): a Password for 'smtp://xypron.glpk@example.com@mail.example.com:587': Syntax error in parameters or arguments

Please, implement the following logic,

If the string preceding a comma is not a valid email address do not split it off.

Best regards

Heinrich Schuchardt