Re: [PATCH 1/3] send-email: add an auto option for transfer encoding

> For most patches, using a transfer encoding of 8bit provides good
> compatibility with most servers and makes it as easy as possible to view
> patches.  However, there are some patches for which 8bit is not a valid
> encoding: RFC 5321 specifies that a message must not have lines
> exceeding 998 octets.
>
> Add a transfer encoding value, auto, which indicates that a patch should
> use 8bit where allowed and quoted-printable otherwise.  Choose
> quoted-printable instead of base64, since base64-encoded plain text is
> treated as suspicious by some spam filters.
>
> Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
> ---
> diff --git a/git-send-email.perl b/git-send-email.perl
> @@ -1852,13 +1851,16 @@ sub apply_transfer_encoding {
> +       $to = ($message =~ /.{999,}/) ? 'quoted-printable' :'8bit'
> +               if $to eq 'auto';

> diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
> +test_expect_success $PREREQ 'long lines with auto encoding are quoted-printable' '
> +       clean_fake_sendmail &&
> +       git send-email \
> +               --from="Example <nobody@example.com>" \
> +               --to=nobody@example.com \
> +               --smtp-server="$(pwd)/fake.sendmail" \
> +               --transfer-encoding=auto \
> +               --no-validate \
> +               longline.patch \
> +               2>errors &&