Is DNS MX Record Required For Email?
Mark_Andrews at isc.org
Tue Feb 14 01:05:44 UTC 2006
> Is it possible to by-pass the DNS lookup for email like it is for HTTP and
> FTP? Is there something about the MX record in DNS that requires a
> "User at DomainName.com" type address for it to work?
> Here's why I ask.
> I have a static, always-on IP address coming into my house. I run Web and
> FTP servers on my PC. They work fine, and have for a long time. My OS is
> Windows NT 2000 Professional.
> When I scan my ports from a remote machine I get what I expect, which is:
> 21 (FTP): Open
> 25 (SMTP): Open
> 80 (WWW): Open
> 110 (POP3): Open
> 143 (IMAP): Open
> I only share data with people I do business with. I prefer to just use my IP
> address instead of aliasing it with a domain name. (For these examples I'll
> use "184.108.40.206", which is of course not my IP. But it's easier to type.) There
> is no DNS entry for "220.127.116.11" anywhere.
> "http://18.104.22.168" gets into my web server without a problem.
> "ftp 22.214.171.124" (DOS prompt) gets to my FTP folder without a problem.
> But..., when I send an email to "User at 126.96.36.199" it fails. I have a mail
> account with a Windows based ISP and am experimenting sending mail from it
> to "User at 188.8.131.52". It doesn't work.
Well to send email to a IP address the correct syntax is
> I have my the mail server on my machine configured correctly. And have the
> domain/accounts set up like they should be, including a "User at 184.108.40.206"
> Any thoughts/tips greatly appreciated.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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