[tor-relays] non-encrypted connections from Tor exit relays

hi, generalized question about Tor exit relays and exit relay operators. do some exit relay operators have a policy to prevent connections leaving their exit node via non-encrypted ports (e.g. port 25)?

this could be a philosophical position - not even wanting to be in a position to observe users' data passing through the exit node in clear text. or a pragmatic position - hoping that encrypted connections provide some level (even very weak) of plausible deniability in the event that a connection attracts the attention of law enforcement. this is just my thoughts.