[gentoo-user] problem with mail server

["Marcin Niśkiewicz" <mniskiewicz@gmail.com>]

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Hello
I'm testing mail server with mysql backend. Generally it works quite well.
But from time to time during testing, single mails can't be send because of
smtp errors:

in mail.log
Feb  3 13:47:37 mail postfix/smtpd[28339]: NOQUEUE: reject: RCPT from
unknown[ip]: 451 4.3.0 <user@domain.org>: <piotrpol@kujawy.com.pl> Temporary
lookup failure; from=<user@domain.org <piotrpol@kujawy.com.pl>> to=<
user@domain2.org <piotrpol@kujawy.com.pl>> proto=ESMTP helo=<domain.org >
in mail.warn
Feb  3 13:47:37 kurier4 postfix/trivial-rewrite[2438]: warning:
transport_maps lookup failure

when I check transport_map:

postconf | grep transport_map
address_verify_transport_maps = $transport_maps
fallback_transport_maps =
mailbox_transport_maps =
mydestination = $myhostname, localhost.localdomain, $transport_maps
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps
$virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains
$relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps
$recipient_canonical_maps $relocated_maps $transport_maps $mynetworks
transport_maps = mysql:/etc/mail/sql/mysql-transport.cf

my /etc/mail/sql/mysql-transport.cf looks like that:
user = postfix
password = password
dbname = maildb
table = transport
select_field = destination
where_field = domain
hosts = 127.0.0.1

Generally I'm thinking that it could be mysql error - but there is nothing
wrong in its error log...
I set really big limit of concurrent connections

max_user_connections = 1000

So what can be wrong?
Any ideas?

Thank in progress for any help
best regards
nichu

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