sendmail administration

Setting privacy flags

The PrivacyOptions (p) option allows you to set certain ``privacy'' flags. Many of them do not give you any extra privacy, rather just insisting that client SMTP servers use the HELO command before using certain commands or adding extra headers to indicate possible spoof attacks.

The option takes a series of flag names; the final privacy is the inclusive ``or'' of those flags. For example:

   O PrivacyOptions=needmailhelo, noexpn

This insists that the HELO or EHLO command be used before a MAIL command is accepted and disables the EXPN command.

For more information, see ``O--set option''.