Comment 19 for bug 141641

This was discussed to death with upstream in https://lists.linux-foundation.org/pipermail/lsb-discuss/2009-June/006031.html . I don't think they'll move away from this silly requirement.

So what we could on on the Ubuntu side is to default to a "invalid-m-t-a" package which implements /usr/bin/sendmail as "exit 1", and if people actually need an MTA, they can pick and install one.