Moderately off topic, but I came across a really good sendmail auth article today, that I bet a few people might find handy. http://www.joreybump.com/code/howto/smtpauth.html easy to follow, tho the SSL part may be omitted for those that choose. jonathan -----Original Message----- From: fedora-list-bounces@xxxxxxxxxx [mailto:fedora-list-bounces@xxxxxxxxxx] On Behalf Of Robert Boucneau Sent: Tuesday, March 30, 2004 6:49 PM To: For users of Fedora Core releases Subject: RE: Fedora core 1 sendmail problems Hi Homer, I'm jumping in late here, but I have read all the preceding messages...it looks to me as though Alexander, et. al. have all the sendmail issues covered. If sendmail works inside and you have your gateway properly configured (which it appears you think you do) then this should not be a sendmail issue. To completely rule out sendmail, I'd suggest setting up a telent server to listen on port 25 (after turning off sendmail) and seeing if you can log in for the outside. If you *can* it's sendmail's configuration. If not, it's either your OS *or* your network. (Personally, I'd skip this step and go right to the networking suggestions below...but this is a valid first step...) Put another machine on your email server's IP address and try to connect to it. That will either show the problem to be internal or external to your machine. (I'm guessing external.) If it's internal to your machine (i.e. you can log onto a different machine's port 25 from the outside if it is on your server's IP address), you can troubleshoot the networking components of your system (the Netfilter (iptables) guys have some pretty clean ways to watch packets transit your system, if you want to troubleshoot) or reinstall the OS (I'd scrub and install, myself, but that's just an opinion.) If it is external to your machine (my guess), then it is either your firewall/router, your cable-modem, or the ISP's router. I'd guess it's your firewall/router or your cable modem (the cable modem is actually a sort of router, not a modem, and it has Network Address Translation, too. so it could be dropping reply packets silently...) To test this, I'd put a machine on the "outside" of your Linksys router/firewall and see if it can connect (i.e. eliminate the cable modem) or I'd remove the firewall/router and see if things work with just the cable-modem. My guess is that in one of those configurations you'll be able to connect from the outside. Whichever device is not connected is the culprit. I'd guess it is the cable modem and you'll have to reconfigure NAT on it... I hope this helps. All the best, Bob -----Original Message----- From: fedora-list-bounces@xxxxxxxxxx [mailto:fedora-list-bounces@xxxxxxxxxx]On Behalf Of Homer Sapions Sent: Tuesday, March 30, 2004 10:36 AM To: fedora-list@xxxxxxxxxx Subject: Re: Fedora core 1 sendmail problems Current status - still not working. I did not manage to work on it much last night but I intend to try again tonight. Fortunately this is a personal web/mail server so inbound mail is for myself and a few other family members only. Port 25 is not being blocked at the ISP or at the linksys. I can send mail out with no problems, but can not receive mail. Traffc _is_ definitely getting to the server on port 25. When I turn on tcpdump or ethereal watching port 25 I see inbound connections, and I see my server attempting to respond. Alexander Dalloz spent a lot of time attempting to help me debug this, doing as I had done previously from another ISP, telnetting to my server on port 25. He did not get an immediate disconnect, but it took a number of seconds. During this time, I could see via tcpdump him connecting to me, and my server attempting to respond, but he never got the ACK back from my server. iptables is not running on the server, and sendmail is not behind tcp-wrappers. I am not aware of any routing problems, because outbound mail works fine, and all of my web pages are working fine, including Squirrelmail, CGI scripts etc. I have nothing in /etc/hosts.allow or /etc/hosts.deny, and I modified my sendmail.mc to comment out the DaemonPort options listing only the loopback IP address, then built a new sendmail.cf with make -C /etc/mail, and restarted the sendmail daemons. Last night I uninstalled iptables and tcp-wrappers to be totally sure there is no correlation, but did not get as far as rebooting and testing some more. I had other problems with my cable modem connection and loss of all internet access for a while. I will try rebooting and testing further as soon as I get home tonight. I will take a look at your how-to doc also and see if I can pick up any possible problems from that. >From: "Rodolfo J. Paiz" <rpaiz@xxxxxxxxxxxxxx> >Reply-To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx> >To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx> >Subject: Re: Fedora core 1 sendmail problems >Date: Tue, 30 Mar 2004 08:58:46 -0600 > >At 13:26 3/29/2004, you wrote: >>I'm running a server - not a client. On the server I need to be able to >>both send and receive mail using SMTP on port 25 to/from other servers. >>I'm not catering for POP mail on port 110. > >Homer, > >I've lost track of what's going on here. What is your current status and >problem? Are you sure it's not a network issue (firewall, router, ISP >blocking the port, etc.)? Try also taking a look at the "Sendmail SMTP AUTH >HOWTO" on my website [1]. While the concept is not exactly what you want, >the steps shown for enabling receive from the network should work for you. > >[1] http://www.simpaticus.com/linux > >Only note that the sendmail.mc included there shows this line: > * define(`confAUTH_OPTIONS', `A')dnl >In reality, the Fedora installation of Sendmail has `A p' instead. Remember >to remove the "p" or else it won't work; this is an error which I have >regrettably not fixed yet in the document. > >Cheers, > > >-- >Rodolfo J. Paiz >rpaiz@xxxxxxxxxxxxxx >http://www.simpaticus.com > > >-- >fedora-list mailing list >fedora-list@xxxxxxxxxx >To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list _________________________________________________________________ Find a broadband plan that fits. 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