The two class
declarations show a similar declaration for use beginning with V8.7 sendmail (but
note that V8.7 and above can still use the old syntax).
Prior to V8 sendmail, if you listed more than MAXTRUST trusted users, sendmail printed
and syslog(3)??™ed a message such as this:
sendmail: too many T lines, 32 max
This message was not fatal. The sendmail program issued it for eachexcess T line
(ignored those trusted users) and continued to run. V8 sendmail has implemented
trusted users as a class, and there is no longer any limit imposed.
Prior to V8 sendmail, if a user who was not trusted attempted to use the -f switch,
that attempt was silently ignored (silently disallowed). Beginning with V8.7 sendmail,
if a user who is not trusted attempts to use the -f switch, that attempt can
produce an X-Authentication-Warning: header (?§25.12.40 on page 1167) if the
PrivacyOptions option (?§24.9.86 on page 1065) has authwarnings listed.
Even though some users find them annoying, we recommend that you always enable
X-Authentication-Warning: headers. They warn of suspicious behavior. If the behavior
is legitimate, modify that behavior to eliminate the header instead of eliminating
the more valuable warning headers.
4.8.2 Security Options
The sendmail program offers several options that can help you to improve the security
at your site.
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