
Summary: Ref T2843. We currently drop any stdout/stderr emitted by sendmail. Instead, use `ExecFuture` so we'll throw an exception with debugging information preserved. @tido, can you apply this and restart the daemons? Test Plan: Rests on @tido Reviewers: tido, btrahan Reviewed By: btrahan CC: aran Maniphest Tasks: T2843 Differential Revision: https://secure.phabricator.com/D5464