BADRCPTDELAY
From Qmail-LDAP Wiki
Contents |
Purpose
BADRCPTDELAY is the time in seconds to delay when peer issues an RCPT TO command on a non-existing local address, similar to TARPITDELAY. It only useful with RCPTCHECK, to prevent Directory Harvest Attacks.
Usage
Specify BADRCPTDELAY in qmail-smtpd.rules file along with RCPTCHECK. (In fact BADRCPTDELAY is not taken into account if RCPTCHECK is not set.) Its value must be an unsigned integer (in quotes).
Affected: qmail-smtpd
Default: not set
Example:
:allow,RCPTCHECK="",BADRCPTDELAY="5"
Note:
- Connection which are delayed take a long time to finish.
- Be aware that this ties up the available qmail-smtpd slots.
- Raise connection limits with tcpserver if neccessary.
