Below are hosts (and DSN errors I'm getting for them)

These are consistent over the last week or two.  Should I contact the
listed contact points or what? (Only reason I know is I've set sendmail to
cc postmaster when errors with MAIL FROM:<>  are encountered...)

Michael Loftis

All of these have had several errors returned over the five day retry
limit.


[log in to unmask]  553 -- Relaying Denied. (Sendmail routes it to
          a 550, user not found error though for some reason...)
[log in to unmask]  Timeout On Connection
[log in to unmask]   Connection Refused
[log in to unmask]  553 -- relaying denied (host explains not in
          my list of allowed rcpthosts #5.7.1 host is m2.usatoday.com)