smtp_sasl_password_maps lookups

2 msg	postmap header_checks error
10 msg	mailbox_command (dovecot lda) stopped working, ...
5 msg	mynetworks via LDAP lookup
7 msg	Local recipient table in LDAP problem
2 msg	proxy_read_maps
1 msg	smtpd_restriction_class and it's lookup
8 msg	Message Rejected
12 msg	Customize to filter attachment ?
2 msg	Relay question
14 msg	unnecessary routing?
4 msg	do not use 'reject_maps_rbl'?
9 msg	Fwd: Postfix in OpenVZ.
2 msg	bypass body_checks for local mail?
4 msg	catchall with relay_recipient_maps
4 msg	'Name server failure' is output

smtp_sasl_password_maps lookups
\ (Marco d'Itri) (23 Jan 2008)
. \ Victor Duchovni (23 Jan 2008)
. \ Patrick Ben Koetter (23 Jan 2008)

16 msg	Postfix Queues on a Ram Disk
15 msg	sendmail compared to smtp sending
3 msg	Postfix does not recognize remote emails
2 msg	How to disable SSLv2 on smtpd opportunistic TLS?

Subject:	smtp_sasl_password_maps lookups
Group:	Postfix-users
From:	(Marco d'Itri)
Date:	23 Jan 2008

Exactly, what are the keys of smtp_sasl_password_maps lookups?
I have been converting some of my old sendmail servers to postfix, and
some postfix *clients* (managed by customers) stopped authenticating.
Authentication does not fail, they do not even try to authenticate
anymore. Both servers are only offering LOGIN and PLAIN.

After investigating with the customers I noticed that their systems are
apparently misconfigured, i.e. they use relayhost=[server] or
smtp:[server] in a transport map but the smtp_sasl_password_maps key
lacks the [].
I can understand why this is not working, and adding the hostname with
[] to the password map fixes it, but why did the postfix client
correctly authenticate to the old sendmail servers?

--
ciao,
Marco