Please note the new locations for the following files.
The helpfile is now located in /etc/mail/helpfile. The old name (/etc/mail/sendmail.hf) has a symbolic link that points to the new name.
The trusted-users file is now located in /etc/mail/trusted-users. During an upgrade, if the old name (/etc/mail/sendmail.ct) is detected, but not the new name, then a hard link from the old name to the new name is created. Otherwise, nothing is done. The default content is root.
The local-host-names file is now located in /etc/mail/local-host-names. During an upgrade, if the old name (/etc/mail/sendmail.cw) is detected, but not the new name, then a hard link from the old name to the new name is created. Otherwise, nothing is done. The default content is zero length.