Is DNS MX Record Required For Email?
base60
nobody at whitehouse.com
Wed Feb 15 00:44:06 UTC 2006
Scooby wrote:
> Is it possible to by-pass the DNS lookup for email like it is for HTTP and
> FTP?
Assming you want to use an IP, yes.
>Is there something about the MX record in DNS that requires a
> "User at DomainName.com" type address for it to work?
No.
>
> 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 "1.2.3.4", which is of course not my IP. But it's easier to type.) There
> is no DNS entry for "1.2.3.4" anywhere.
>
> "http://1.2.3.4" gets into my web server without a problem.
> "ftp 1.3.3.4" (DOS prompt) gets to my FTP folder without a problem.
Many mail relays will assume this is spam in an email and refuse it.
>
> But..., when I send an email to "User at 1.2.3.4" it fails. I have a mail
> account with a Windows based ISP and am experimenting sending mail from it
> to "User at 1.2.3.4". It doesn't work.
Because you didn't use the correct syntax.
>
> 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 1.2.3.4"
> account.
Many mail relays will assume you're a spammer and refuse the connection.
>
> Any thoughts/tips greatly appreciated.
OK... there is no upside to what you're trying to do and lots on
the downside...
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