Hi, i dont know if it still fits with opensuse or not, but i have problems with my mail server. I have 2 servers, 1 for smtp smtp.kosmojaya.com, 1 for mx mail.kosmojaya.com (with pop3 in it). In smtp server i also add SMTP-AUTH so our user from outside office still can use our smtp. But lately, when user sent mail to this domain, sometimes (not always) they get error: timed out while receving the initial server greeting. and their mail just stuck from couple of minutes to 2-3 hours before they arrived to mail.kosmojaya.com. Why does it happend ? Here the errors Jun 23 09:39:02 sms2 postfix/qmgr[5229]: 90E4A6FE58: from=, size=39797, nrcpt=14 (queue active) Jun 23 09:39:03 sms2 postfix/smtp[2752]: D9AF06FE56: lost connection with a.mx.mail.yahoo.com[67.195.168.31] while receiving the initial server greeting Jun 23 09:39:11 sms2 postfix/smtp[2233]: 162B86FE5D: to=, relay=gmail-smtp-in.l.google.com[209.85.222.65]:25, delay=16, delays=0.34/0.01/8.1/7.1, dsn=2.0.0, status=sent (250 2.0.0 OK 1245724750 39si5392010pzk.83) Jun 23 09:39:11 sms2 postfix/qmgr[5229]: 162B86FE5D: removed Jun 23 09:40:07 sms2 postfix/smtp[2232]: 1D0A36FE59: to=, relay=mail2.fortunestar.co.id[122.200.149.230]:25, delay=450, delays=18/0.01/417/15, dsn=2.0.0, status=sent (250 ok 1245724807 qp 21979) Jun 23 09:40:36 sms2 postfix/smtp[2795]: 90E4A6FE58: to=, relay=gajah.kosmojaya.com[122.200.149.230]:25, delay=1560, delays=1467/0.08/81/12, dsn=2.0.0, status=sent (250 ok 1245724835 qp 22101) Jun 23 09:40:36 sms2 postfix/smtp[2795]: 90E4A6FE58: to=, relay=gajah.kosmojaya.com[122.200.149.230]:25, delay=1560, delays=1467/0.08/81/12, dsn=2.0.0, status=sent (250 ok 1245724835 qp 22101) Jun 23 09:40:36 sms2 postfix/smtp[2795]: 90E4A6FE58: to=, relay=gajah.kosmojaya.com[122.200.149.230]:25, delay=1560, delays=1467/0.08/81/12, dsn=2.0.0, status=sent (250 ok 1245724835 qp 22101) Jun 23 09:40:36 sms2 postfix/smtp[2795]: 90E4A6FE58: to=, relay=gajah.kosmojaya.com[122.200.149.230]:25, delay=1560, delays=1467/0.08/81/12, d And this is my postfix configuration. alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix fast_flush_purge_time = 7d fast_flush_refresh_time = 20m home_mailbox = Maildir/ inet_interfaces = all inet_protocols = all mailbox_command = mailbox_size_limit = 0 milter_default_action = accept milter_protocol = 2 mydestination = $myhostname, localhost.$mydomain myhostname = smtp1.kosmojaya.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 122.200.149.230 192.127.0.0/24 myorigin = /etc/mailname non_smtpd_milters = inet:localhost:8891,inet:localhost:8892 readme_directory = no recipient_delimiter = + relayhost = smtp_tls_note_starttls_offer = yes smtp_tls_security_level = may smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (opensuse) smtpd_milters = inet:localhost:8891,inet:localhost:8892 smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = smtpd_sasl_security_options = noanonymous smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem smtpd_tls_auth_only = no smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt smtpd_tls_key_file = /etc/ssl/private/smtpd.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_security_level = may smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom I googled and find solution by adding "echo 0 > /proc/sys/net/ipv4/tcp_window_scaling" in both servers but the problem stil exist. BTW, we dont have problem when send to another domain like gmail, or this mailing list. So the problem is when we send to this domain (our mail server) Anyone has suggestion how to fix it ? regards, -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org