Sorry, I failed to put postconf -n output in my first post... Server: Centos-5.5 postfix-2.3.3-2.1.centos.mysql_pgsql
See server log below. Client: MS Windows XP 2002 sp3 avast-5.0.545 behind a NAT router 66.6.120.250 with avast mail scanner on: C:\telnet smtp 25 421 Connection to host lost C:\ with avast mail scanner off I get the normal: C:\telnet smtp 25 Trying 66.36.120.9... Connected to smtp.rockymountains.net (66.36.120.9). Escape character is '^]'. 220 smtp.rockymountains.net ESMTP Postfix [smtp log]# tail -f maillog | grep 66.36.120.250 Dec 22 11:15:36 smtp postfix/smtpd[8084]: connect from mcw-office.rockymountains.net[66.36.120.250] Dec 22 11:15:36 smtp postfix/smtpd[8084]: match_hostaddr: 66.36.120.250 ~? 66.36.112.0/20 Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 220 smtp.rockymountains.net ESMTP Postfix Dec 22 11:15:36 smtp postfix/smtpd[8084]: < mcw-office.rockymountains.net[66.36.120.250]: EHLO Kitten Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-smtp.rockymountains.net Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-PIPELINING Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-SIZE 10240000 Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-VRFY Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-ETRN Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-AUTH PLAIN Dec 22 11:15:36 smtp postfix/smtpd[8084]: match_list_match: 66.36.120.250: no match Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-AUTH=PLAIN Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-ENHANCEDSTATUSCODES Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250-8BITMIME Dec 22 11:15:36 smtp postfix/smtpd[8084]: > mcw-office.rockymountains.net[66.36.120.250]: 250 DSN Dec 22 11:15:36 smtp postfix/smtpd[8084]: match_hostaddr: 66.36.120.250 ~? 66.36.112.0/20 Dec 22 11:15:36 smtp postfix/smtpd[8084]: lost connection after EHLO from mcw-office.rockymountains.net[66.36.120.250] Dec 22 11:15:36 smtp postfix/smtpd[8084]: disconnect from mcw-office.rockymountains.net[66.36.120.250] [smtp log]# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 debug_peer_list = 66.36.120.250, 66.36.120.1, 66.36.120.13 html_directory = no in_flow_delay = 1s inet_interfaces = localhost, 66.36.120.9, 66.36.120.12 mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost mynetworks = 66.36.112.0/20, 65.183.79.0/24, 127.0.0.0/8 newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES sample_directory = /usr/share/doc/postfix-2.3.3/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_path = /var/spool/postfix/private/auth smtpd_sasl_type = dovecot unknown_local_recipient_reject_code = 550 virtual_alias_domains = hash:/etc/postfix/virtual_domain virtual_alias_maps = hash:/etc/postfix/virtual I didn't send the EHLO command or anything of the other commands, I only did the "telnet smtp 25" command at the command prompt. Apparently avast sends those commands. I have used postfix for many years as the main server for a small town ISP (about 2000 email accounts) and had to replace an old server with this newer one. Many of my customers use avast/windows and can't send. Any ideas what avast does to trigger the (I assume) concurrency limit? Or better yet, what I can do to get it to stop? Maybe point me to a thread? My apologies in advance, if in my searches I somehow missed the thread that has already dealt with this. Joseph Conrad Mountain Computer Wizards, Inc. Buena Vista, Colorado
