Re: [courier-users] RE: Debugging SMTP timeout problems
On Wed, 4 Jun 2003, Robert Penz wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Wednesday 04 June 2003 20:42, Julian Mehnle wrote: Currently, not even $ dig blackholes.mail-abuse.org NS works for me. NS does work whitestar# dig blackholes.mail-abuse.org NS ; DiG 9.2.1 blackholes.mail-abuse.org NS ;; global options: printcmd ;; Got answer: ;; -HEADER- opcode: QUERY, status: NOERROR, id: 29919 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;blackholes.mail-abuse.org. IN NS ;; ANSWER SECTION: blackholes.mail-abuse.org. 82148 IN NS west1.mail-abuse.org. blackholes.mail-abuse.org. 82148 IN NS europe1.mail-abuse.org. blackholes.mail-abuse.org. 82148 IN NS east1.mail-abuse.org. ;; Query time: 1 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Wed Jun 4 22:38:27 2003 ;; MSG SIZE rcvd: 105 but I get no IP for blackholes.mail-abuse.org whitestar:# dig blackholes.mail-abuse.org ; DiG 9.2.1 blackholes.mail-abuse.org ;; global options: printcmd ;; Got answer: ;; -HEADER- opcode: QUERY, status: NXDOMAIN, id: 64561 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;blackholes.mail-abuse.org. IN A ;; Query time: 173 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Wed Jun 4 22:38:30 2003 ;; MSG SIZE rcvd: 43 This is a bit off-topic for the list, but the above is correct because blackholes.mail-abuse.org is a zone, and not a host. Hence no A record, but you do get the NS records. Try something like this for A records: ~$ dig 189.45.242.194.blackholes.mail-abuse.org. +short If the IP address in question is listed, you'll have 127.0.0.2 returned. More info at: http://mail-abuse.org/rbl/usage.html -- Juha Saarinen --- This SF.net email is sponsored by: Etnus, makers of TotalView, The best thread debugger on the planet. Designed with thread debugging features you've never dreamed of, try TotalView 6 free at www.etnus.com. ___ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
[courier-users] RE: Debugging SMTP timeout problems
Robert Penz [EMAIL PROTECTED] wrote: I've the same problems since yesterday .. I can't send a mail via smtp auth for about 5 min or so, after that time it works again until the next 5 problem minutes. I've tried to narrow the problem down. during this 5 mins I get only this, after this I time I get the server greeting. I've tried it from 5 computers (everyone in a other subnet and other dns servers) always the same. on localhost it works always. This looks very much like a reverse DNS problem. I've used dig -x client_ip during this time to check if the dns stuff works and yes that does. I've following running, whichs is not the same as you've ? BLACKLISTS=-block=blackholes.mail-abuse.org,BLOCK/127.0.0.2 -block=relays.mail-abuse.org,BLOCK/127.0.0.2 -block=dialups.mail-abuse.org,BLOCK/127.0.0.2 Have you tried the following? $ dig 225.85.30.195.blackholes.mail-abuse.org ANY $ dig 225.85.30.195.blackholes.mail-abuse.org PTR Currently, not even $ dig blackholes.mail-abuse.org NS works for me. It seems[1] like the registration period for the mail-abuse.net domain has expired, and MAPS LLC forgot to renew it. Julian. [1] http://www.mehnle.net/tools/whois?object=mail-abuse.net --- This SF.net email is sponsored by: Etnus, makers of TotalView, The best thread debugger on the planet. Designed with thread debugging features you've never dreamed of, try TotalView 6 free at www.etnus.com. ___ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
[courier-users] Re: Debugging SMTP timeout problems
Robert Penz writes: I've tried to narrow the problem down. during this 5 mins I get only this, after this I time I get the server greeting. I've tried it from 5 computers (everyone in a other subnet and other dns servers) always the same. on localhost it works always. $ telnet outertech.com 25 Trying 194.242.45.189... Connected to outertech.com. Escape character is '^]'. I've used dig -x client_ip during this time to check if the dns stuff works and yes that does. I've following running, whichs is not the same as you've ? BLACKLISTS=-block=blackholes.mail-abuse.org,BLOCK/127.0.0.2 - -block=relays.mail-abuse.org,BLOCK/127.0.0.2 - -block=dialups.mail-abuse.org,BLOCK/127.0.0.2 ... and you are actually paying a licensing fee to MAPS, for using their RBL, or have a gratis contractual agreement with them, correct? Otherwise, they've probably firewalled you off, as a nuisance, and all your DNS queries are timing out. --- This SF.net email is sponsored by: Etnus, makers of TotalView, The best thread debugger on the planet. Designed with thread debugging features you've never dreamed of, try TotalView 6 free at www.etnus.com. ___ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
[courier-users] RE: Debugging SMTP timeout problems
Julian Mehnle [EMAIL PROTECTED] wrote: Robert Penz [EMAIL PROTECTED] wrote: I've following running, whichs is not the same as you've ? BLACKLISTS=-block=blackholes.mail-abuse.org,BLOCK/127.0.0.2 -block=relays.mail-abuse.org,BLOCK/127.0.0.2 -block=dialups.mail-abuse.org,BLOCK/127.0.0.2 Have you tried the following? $ dig 225.85.30.195.blackholes.mail-abuse.org ANY $ dig 225.85.30.195.blackholes.mail-abuse.org PTR Currently, not even $ dig blackholes.mail-abuse.org NS works for me. It seems[1] like the registration period for the mail-abuse.net domain has expired, and MAPS LLC forgot to renew it. [1] http://www.mehnle.net/tools/whois?object=mail-abuse.net Doh, I'm talking nonsense. mail-abuse.org is different from mail-abuse.net! The correct WHOIS query would be: http://www.mehnle.net/tools/whois?object=mail-abuse.org which clearly shows that mail-abuse.org has *not* expired. Sorry for the confusion. However, the `dig`s were correct though, and they're still timing out. Julian. --- This SF.net email is sponsored by: Etnus, makers of TotalView, The best thread debugger on the planet. Designed with thread debugging features you've never dreamed of, try TotalView 6 free at www.etnus.com. ___ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] RE: Debugging SMTP timeout problems
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Wednesday 04 June 2003 20:42, Julian Mehnle wrote: Currently, not even $ dig blackholes.mail-abuse.org NS works for me. NS does work whitestar# dig blackholes.mail-abuse.org NS ; DiG 9.2.1 blackholes.mail-abuse.org NS ;; global options: printcmd ;; Got answer: ;; -HEADER- opcode: QUERY, status: NOERROR, id: 29919 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;blackholes.mail-abuse.org. IN NS ;; ANSWER SECTION: blackholes.mail-abuse.org. 82148 IN NS west1.mail-abuse.org. blackholes.mail-abuse.org. 82148 IN NS europe1.mail-abuse.org. blackholes.mail-abuse.org. 82148 IN NS east1.mail-abuse.org. ;; Query time: 1 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Wed Jun 4 22:38:27 2003 ;; MSG SIZE rcvd: 105 but I get no IP for blackholes.mail-abuse.org whitestar:# dig blackholes.mail-abuse.org ; DiG 9.2.1 blackholes.mail-abuse.org ;; global options: printcmd ;; Got answer: ;; -HEADER- opcode: QUERY, status: NXDOMAIN, id: 64561 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;blackholes.mail-abuse.org. IN A ;; Query time: 173 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Wed Jun 4 22:38:30 2003 ;; MSG SIZE rcvd: 43 - -- Regards, Robert - Robert Penz robert.penz AT outertech.com -BEGIN PGP SIGNATURE- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE+3lie8tTsQqJDUBMRAts0AJ49nF+hoC0nNizbgB/PP73E/2VQYwCfcfEx 54lZ3LNDXwghRyt7nymjIe8= =yTuc -END PGP SIGNATURE- --- This SF.net email is sponsored by: Etnus, makers of TotalView, The best thread debugger on the planet. Designed with thread debugging features you've never dreamed of, try TotalView 6 free at www.etnus.com. ___ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
[courier-users] RE: Debugging SMTP timeout problems
Julian Mehnle wrote: [...] Today, the SMTP server started to act up: it accepts TCP connections virtually immediately, but then reacts only very, very slowly. Thus, most of the time, the connection times out on the client/peer side. [...] Can anyone give me some hints on how to debug the SMTP server's miserable performance? I just read that the SpamCop DNS blacklist, which I'm using, has very recently dropped out, so this is probably the cause. Please ignore my mail -- if the problem persists when the SpamCop blacklist starts working again, I'll continue debugging. Julian. --- This SF.net email is sponsored by: eBay Get office equipment for less on eBay! http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5 ___ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
[courier-users] Re: Debugging SMTP timeout problems
Julian Mehnle writes: Hi all, I have been running Courier 0.39.1 on Debian Linux as my mail server (SMTP(S), POP3(S), IMAP(S)) for about a year now without any noteworthy problems. Today, the SMTP server started to act up: it accepts TCP connections virtually immediately, but then reacts only very, very slowly. Thus, most of the time, the connection times out on the client/peer side. Other services (POP3, HTTP, ...) work as perfectly as ever. Since there are no error messages in the logs, and the server's load is negligible (below 0.5 at all times), I'm suspecting a hardware error (e.g. harddisk), even though there are no hardware error messages in the logs as well so far. Can anyone give me some hints on how to debug the SMTP server's miserable performance? It a DNS or a firewall issue. Incoming SMTP connections have the client's IP address resolved via DNS, followed by an ident query. A nonfunctioning DNS server somewhere, or a broken firewall that's dropping identd packets, would slow things down. --- This SF.net email is sponsored by: eBay Get office equipment for less on eBay! http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5 ___ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
