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Ident perhaps
Thank you! And the hint submitter!
This has been driving me nuts for months. I even setup my own SMTP server on my firewall/NAT machine, with no luck. I added port 113 to my allowed ports in the firewall preferences, and now my emails go in a flash even using my ISP's servers. -Esme
Mail server, client firewall tips
If you run mail services, you can disable or lower ident lookup timeouts; older versions of mail servers set a 30 second timeout, while more recent ones set much lower values. $ grep Timeout.ident /etc/mail/sendmail.cf #O Timeout.ident=5s The above sets a default five second ident lookup timeout in sendmail; a custom value would not be commented out. To set a custom value, use something like the following in your sendmail.mc, then rebuild sendmail.cf. define(`confTO_IDENT', `1s') For more information on sendmail, see my sendmail configurations and documentation. On the client side of things, one can effect an immediate timeout while still firewalling the ident port by sending back a "that port is closed" response from the firewall. /sbin/ipfw add reset tcp from any to any 113 in
For more firewall rule examples, see how I run ipfw on my Mac. |
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