mailprod: use SCC SMTP server as a relay
mailprod: use SCC SMTP server as a relay

SCC blocks SMTP traffic so we need to use their server as a relay.
Because the server is connected to the internal network, we don't need
any authentification to justify this action.

Signed-off-by: Marco Neumann <3829486b93ec44395f0b980424bae9b6fb07b7bc@crepererum.net>

spz-signup/spz-signup