The KNOWNBUGS File
The KNOWNBUGS file contains a (not always up-to-date) list of the most difficult bugs to fix in the sendmail program. Presence of this file ought not suggest that sendmail is distributed with bugs. Rather, it should assure you that reported bugs are admitted to and dealt with.
If you encounter behavior with sendmail that appears to be a bug in sendmail and not in another program, document that bug carefully so that it can be repeated, then find the email address to which to submit your report at http://www.sendmail.org/support/.
If you encounter a security problem with sendmail, use the fingerprint and public key stored in the PGPKEYS file to encrypt a message before submitting a report. Always try to avoid sending security-related email in clear text.
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