I am running Debian 4 with postfix and am sending email from my thunderbird client. I set up main.cf as seen below. The problem is when I send an email from the thunderbird client the "sending message" bar takes between 8-10 seconds to send the email. The email sends just fine and is received fine but something is obviously not working 100% I don't see any errors in the mail log so what could be the cause? My other server (running vhcs) sends smtp immediately. Code: smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) biff = no append_dot_mydomain = no smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_use_tls = yes smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache myhostname = server.northerner.se alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydomain = $myhostname myorigin = $mydomain mydestination = $myhostname, /etc/postfix/virtual/domains, localhost virtual_maps = hash:/etc/postfix/virtual/addresses relayhost = mynetworks = 127.0.0.0/8 mailbox_command = mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all smtpd_sasl_local_domain = smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_tls_auth_only = no smtp_use_tls = yes smtp_tls_note_starttls_offer = yes smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s smtpd_error_sleep_time = 2 tls_random_source = dev:/dev/urandom home_mailbox = Maildir/
Just to add some extra info doing a telnet on the port takes up to 10 seconds as well while doing telnet on port 110 is istantaneous. maybe its a dns lookup problem but i am unsure how to fix it.
Yes it's a DNS lookup problem. Login to your FTP server will probably also be slow. http://www.howtoforge.com/forums/showthread.php?t=5407&highlight=slow+login and: http://www.howtoforge.com/forums/search.php?searchid=422561
