Thanks Victor,

> 
> On Wed, Jul 01, 2009 at 02:48:00PM +0200, Rocco Scappatura wrote:
> 
> > Hello,
> >
> > I have enabled "sender_bcc_maps" in my main.cf. The lookup file has
> just
> > 2 entries.
> 
> What fraction of your traffic is sent by these 2 entries. Do you have
> content filters downstream of the cleanup service that adds the bcc
> addresses? Report your configuration:
> 
>       http://www.postfix.org/DEBUG_README.html#mail
> 

A neglegible one. Yes, I have set up a content filter (amavisd-new).
Anyway, here is my postconf output:

alias_maps = hash:/etc/aliases
anvil_rate_time_unit = 60s
bounce_size_limit = 1
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
default_process_limit = 150
html_directory = no
inet_interfaces = $myhostname, localhost
local_recipient_maps = unix:passwd.byname $alias_maps
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailq_path = /usr/bin/mailq
manpage_directory = /usr/local/man
message_size_limit = 35840000
minimal_backoff_time = 1800s
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mydomain = av2.sttspa.it
myhostname = av2.sttspa.it
mynetworks = /etc/postfix/relayzahra2
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
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
proxy:mysql:/etc/postfix/mysql-check-recipient-access.cf
proxy:mysql:/etc/postfix/mysql-check-client-access.cf
proxy:mysql:/etc/postfix/mysql-check-sender-access.cf
proxy:mysql:/etc/postfix/mysql-relay-recipients.cf
proxy:mysql:/etc/postfix/mysql-transport.cf
proxy:mysql:/etc/postfix/mysql-check-client-filter-access.cf
queue_directory = /var/spool/postfix
readme_directory = no
relay_domains = proxy:mysql:/etc/postfix/mysql-relay-domains.cf
relay_recipient_maps =
proxy:mysql:/etc/postfix/mysql-relay-recipients.cf
sample_directory = /etc/postfix
sender_bcc_maps = hash:/etc/postfix/sender_bcc
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtp_connect_timeout = 30s
smtp_discard_ehlo_keyword_address_maps =
hash:/etc/postfix/mta_workarounds
smtpd_banner = $myhostname
smtpd_client_connection_count_limit = 50
smtpd_client_connection_rate_limit = 100
smtpd_client_event_limit_exceptions = <list of IPs>
smtpd_client_message_rate_limit = 60
smtpd_client_recipient_rate_limit = 250
smtpd_client_restrictions = check_client_access
proxy:mysql:/etc/postfix/mysql-check-client-filter-access.cf
smtpd_end_of_data_restrictions =
smtpd_helo_restrictions =
smtpd_recipient_restrictions = check_client_access
proxy:mysql:/etc/postfix/mysql-check-client-access.cf
permit_mynetworks    permit_sasl_authenticated
reject_unauth_destination    reject_non_fqdn_sender
reject_non_fqdn_recipient    reject_unlisted_sender
reject_unlisted_recipient    reject_unknown_sender_domain
reject_invalid_hostname    reject_rbl_client zen.spamhaus.org
reject_rbl_client list.dsbl.org
smtpd_sasl_auth_enable = yes
smtpd_sender_restrictions = check_sender_access
proxy:mysql:/etc/postfix/mysql-check-sender-access.cf
check_recipient_access
proxy:mysql:/etc/postfix/mysql-check-sender-access.cf
check_recipient_access
proxy:mysql:/etc/postfix/mysql-check-recipient-access.cf
strict_rfc821_envelopes = yes
transport_maps = proxy:mysql:/etc/postfix/mysql-transport.cf
unknown_local_recipient_reject_code = 550
unverified_recipient_reject_code = 550

> > I have noticed that the number of message in active queue grews as
> soon
> > as I enable this feature.
> 
> Your observations are flawed, this processing happens before the
> message
> enters the active queue, so more latency upstream would actually
reduce
> the size of the active queue unless you significantly increase the
> number of output messages per input message, which suggests a
> misconfigured
> content filter or similar.

OK. I have applied configuration updating during a congested moment.. I
fear that this has increased congestion as result.

Then I have rolled back modifications and all (slowly) have returned to
work normally.

Finally, I have applied again configuration modification (which uses
'sender_bcc_maps') yesterday night and tomorrow all works fine without
(at least at the moment) active queue congestion.

What it could be happen? 

Thanks,

rocsca

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