BUG/MINOR: mailers: negotiate SMTP, not ESMTP

As per issue #1552 the mailer code currently breaks on ESMTP multiline
responses. Let's negotiate SMTP instead.

Should be backported to 2.0.

(cherry picked from commit 1a16e4ebcb6d5848dd867a4ef3edda3760c60124)
Signed-off-by: William Lallemand <wlallemand@haproxy.org>
(cherry picked from commit 667c78079f0a6e33a670495c8f0728400c98700c)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed