verify parameters - ReadList.com

10 msg	header check question

verify parameters
\ egoitz (9 May 2008)
. \ Matthias Haegele (9 May 2008)
. \ (Wietse Venema) (9 May 2008)
. . \ egoitz (9 May 2008)
. \ egoitz (9 May 2008)
. . \ (Wietse Venema) (9 May 2008)
. . . \ egoitz (10 May 2008)
. . . . \ (Wietse Venema) (10 May 2008)
. . . . . \ Terry Carmen (10 May 2008)
. . . . . \ egoitz (11 May 2008)
. . . . . . \ egoitz (11 May 2008)
. . . . . . \ (Wietse Venema) (11 May 2008)

4 msg	Configure postfix in big env
2 msg	envelope sender '<>' via uucp gets rewrit...
2 msg	Spam filtering only for specific email accounts
3 msg	Postfix 2.4 to 2.5: smtp(d)_tls_session_cache_d...
15 msg	Question about 'standards' WRT BATV and SAV
7 msg	my solution to fight backscatter email
2 msg	AUTO: Joe Grastara is out of the office (return...
12 msg	Q about sender_dependent_relayhost_maps inbound...
16 msg	Milter Suggestions
9 msg	Transport table and postmap
3 msg	Archiving e-mail?
8 msg	Error 550: unable to relay
1 msg	FW: new subject
13 msg	TLS handshake error
6 msg	Seperating SMTP and POP/IMAP services
3 msg	Test 2
1 msg	Testing
12 msg	[Fwd: ldap users & aliases config]

Subject:	verify parameters
Group:	Postfix-users
From:	egoitz
Date:	9 May 2008

Hi,

I'm using a postfix mail scanning machine for doing relay to another
server wich stores user mailboxes and has his own smtp (a cpanel machine).

Like domain admins could create or delete mail accounts I have enabled in
my postfix scanning machine reject_unverified_recipient. Have done some
checks and have this settings in main.cf file:

address_verify_positive_refresh_time = 3m
address_verify_positive_expire_time = 8m
address_verify_negative_refresh_time = 5m
address_verify_negative_expire_time = 10m

Have done this test :

create a mail account, send a mail to him through postfix (so it should be
positive cached) later remove the mail account (so waiting supposed 3 m it
should be negatively cached) that didn't occur and had to wait more or
less 20 minutes for it be negatively cached... after that I created it and
more or less in 5 minutes it was positively cached again...

so is there any minimum time for positive caching??? the main.cf
explanation of postfix.org (http://www.postfix.org/postconf) doesn't
explain something about minimum values? do they exist??

Why is not this advised for high traffic sites (as said in man pages)? I
think this is an ideal solution for scanning machines in ISP's in wich you
can't know wich recipients are in the other place...