On Sun, 2010-03-21 at 16:18 -0500, Les Mikesell wrote: > Gregory P. Ennis wrote: > > Dear List, > > > > I recently spent some time out of the USA, and found myself in a hotel > > that blocked port 25 which prevented my laptop's ability to connect to > > my office mail server. I did a scan on the internet and made the > > observation that this was a common problem. I had port 22 available so > > I was able to get my office server set up to accept mail on 25 and 587 > > without difficulty. The command "telnet mail.server.com 587" to my > > office mail server connects without difficulty. > > > > However, I have not been able to get sendmail on my laptop to connect to > > sendmail on my mail server at home using port 587. > > > > I have added the following to sendmail.mc on my laptop without success : > > > > define(`RELAY_MAILER_ARGS', `TCP $h 587') > > define(`ESMTP_MAILER_ARGS', `TCP $h 587') > > > > I finally made it back home, but have decided to change my configuration > > to use 587 by default so that this problem will be avoided, but I have > > been unable to get my laptop to connect. > > > > Anyone having ideas would be appreciated. > > Usually you would block 587 inbound on your own office firewall and use that to > distinguish between locally-submitted mail and internet-received. You > definitely don't want to permit relaying from un-authenticated internet sources. > If you need access to other office resources, one approach would be to set up > openvpn on an office server and the laptop so you have an encrypted connection > through the firewall. Another would be to set up sendmail to require > authentication on port 587 and also set up your laptop to send authentication. > Dear Les, I appreciate your advice about having un-authenticated relaying, and understand the importance of having this blocked. My sendmail office server will only allow relaying with authentication using : define(`confAUTH_OPTIONS', `A p y')dnl My problem is using port 587 on the laptop sendmail that is trying to send e-mail to my office sendmail server. I have been unable to get sendmail on the laptop to connect to the office server using port 587. Your idea of using openvpn is interesting. I have not experimented with this yet, but will download it and take a look. My presumption is that it needs to be on both the laptop as well as office server. If you have other ideas would appreciate your assistance. Thanks for your help!!! Greg _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos