On 08/16/2010 10:46 AM, JD wrote: > > Clearly, a full setup of DNS server for your domain > must be set up, per this wiki, along with mx records ...etc. > > Does this prevent one from settiing up and using sendmail > on a LAN to send and receive email to/from the outside world? Not by itself, but I don't like the advice in that tutorial. It suggests a configuration with a catch-all address. Long-term, you'll find that you have to turn this off or else your catch-all will receive an enormous amount of spam sent by spammers who used a dictionary attack and found that every address they test is valid on your system. Without a catch-all, there's no purpose in using the virtual user feature at all, so the howto is somewhat more complicated than it needs to be. Beyond that, it does not address several practical concerns with setting up a mail server. First, you'll need a static address and a proper PTR for it. You won't be able to set up a PTR without a static address, and if the reverse lookup for your IP address isn't valid, many systems will refuse your mail. The reverse lookup (PTR) for your address must be a hostname that resolves to your IP. aa.bb.cc.dd -> PTR myhost.example.com myhost.example.com -> A aa.bb.cc.dd You should also look up your IP address on a blacklist watcher: http://www.dnswatch.info/dns/rbl-lookup If you're listed in one of the dynamic IP blacklists, you want to set up a smart host through which you'll relay mail. Many sites will otherwise reject your messages. Likewise, if your ISP prevents you from making outbound connections to port 25, you'll need to use a smart host, because you couldn't send mail any other way. > I understand that some things need to be set up so that sendmail > sends headers that use a routable IP address as the source of > the message. Is it possible to make sendmail use my router's > public IP address in the message headers? How? No, that's not quite right. Sendmail should be configured to use a valid hostname for HELO, but the IP address will be recorded in a header which is set by the receiver of the message. You can't do anything to change that. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
