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-rw-r--r--src/Propellor/Property/Postfix.hs5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/Propellor/Property/Postfix.hs b/src/Propellor/Property/Postfix.hs
index 20492dc6..356a945f 100644
--- a/src/Propellor/Property/Postfix.hs
+++ b/src/Propellor/Property/Postfix.hs
@@ -134,6 +134,11 @@ dedupCf ls =
-- Does not configure postfix to use it; eg @smtpd_sasl_auth_enable = yes@
-- needs to be set to enable use. See
-- <https://wiki.debian.org/PostfixAndSASL>.
+--
+-- Password brute force attacks are possible when SASL auth is enabled.
+-- It would be wise to enable fail2ban, for example:
+--
+-- > Fail2Ban.jailEnabled "postfix-sasl"
saslAuthdInstalled :: Property NoInfo
saslAuthdInstalled = setupdaemon
`requires` Service.running "saslauthd"