Hello I have been fighting with a problem with Postfix. There are some users that insist on sending mail to large groups of recipients (yes I know that mailman or similar is made for that) and there is a limit of number of recipients, which I have after extensive testing managed to pinpoint to 500 recipients. Less or equal amount goes, 501 not. And the size of the header or mail body doesn't seem to be of any significance.
Now...where on Earth (or at least Postfix) this limit of 500 comes from? Here is the result of postconf -n: alias_maps = hash:/etc/aliases,hash:/var/lib/mailman/data/aliases biff = no canonical_maps = hash:/etc/postfix/canonical command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/lib/postfix debug_peer_level = 2 defer_transports = disable_dns_lookups = no disable_mime_output_conversion = no html_directory = /usr/share/doc/packages/postfix/html inet_interfaces = all inet_protocols = all mail_owner = postfix mail_spool_directory = /var/mail mailbox_command = mailbox_size_limit = 0 mailbox_transport = mailq_path = /usr/bin/mailq manpage_directory = /usr/share/man masquerade_classes = envelope_sender, header_sender, header_recipient masquerade_domains = masquerade_exceptions = root message_size_limit = 10240000 mydestination = $myhostname, localhost.$mydomain myhostname = listserv.kuntaliitto.fi mynetworks = 10.0.0.0/16, 127.0.0.0/8, 192.168.1.0/24 newaliases_path = /usr/bin/newaliases queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/packages/postfix/README_FILES relay_domains = $mydestination, kuntaliitto.fi, kommunforbundet.fi, phnet.fi relay_recipient_maps = relayhost = relocated_maps = hash:/etc/postfix/relocated sample_directory = /usr/share/doc/packages/postfix/samples sender_canonical_maps = hash:/etc/postfix/sender_canonical sendmail_path = /usr/sbin/sendmail setgid_group = maildrop smtp_sasl_auth_enable = no smtp_use_tls = no smtpd_client_restrictions = smtpd_helo_required = no smtpd_helo_restrictions = smtpd_recipient_limit = 1002 smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination smtpd_sasl_auth_enable = no smtpd_sender_restrictions = hash:/etc/postfix/access smtpd_use_tls = no strict_8bitmime = no strict_rfc821_envelopes = no transport_maps = hash:/etc/postfix/transport unknown_local_recipient_reject_code = 550 virtual_alias_domains = hash:/etc/postfix/virtual virtual_alias_maps = hash:/etc/postfix/virtual If you need some further information I am happy to provide it - whatever to get away from those nagging users ;) TIA hannu
