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not able to receive e-mails from outside domains

mahesh
9/25/2004 12:24:46 PM

iis smtp nntp:

hi guys,

i need help in receiving mails from outside domains. i
have an exchange server at home (testing). i am able to
send mails outside but not able to receive mails. i
checked the connectivity from my firewall using telnet. it
tested out successfull. i do not have any domain name
registered. i do need to have one?any help is appreciated.

Re: not able to receive e-mails from outside domains

m.marien
9/25/2004 4:40:08 PM

[quoted text, click to view]

In order to recieve email over the Internet you need a registered domain and
MX record so that other email servers know how to contact your server. In
addition your SMTP server will only accept mail for a domain. I don't think
it's possible to use an IP address. How are your messages addressed ?

Re: not able to receive e-mails from outside domains

Jeff Henkels
9/27/2004 8:04:34 AM

[quoted text, click to view]

In fact, it is NOT supported by the IIS SMTP server -- if you were to go to
http://www.dnsreport.com and generate a report for such a domain, you'd get
a warning to that effect. FWIW, said warning references RFC 1123 section
5.2.17 instead of RFC 2821 section 4.1.2.

Re: not able to receive e-mails from outside domains

Peter Karsai
9/27/2004 8:31:40 AM

[quoted text, click to view]
</sip>

Well, it is technically possible, but I agree that MX should be used.

Per RFCs, A DNS RRs or IP addresses are OK, but setting up MX records for a
mail-enabled domain is *strongly* recommended. Still surprisingly many
domain admins forget to set up MX (and even more forget about PTRs).

IP-style addressing (e.g. someone@[1.2.3.4]) is allowed by RFCs (see RFC
2821 section 4.1.2 "domain" definition), but it is rarely supported by
Internet software.

Peter Karsai
http://www.vamsoft.com/orf

Re: not able to receive e-mails from outside domains

Peter Karsai
9/27/2004 2:27:31 PM

Hi Jeff,

[quoted text, click to view]

Indeed, that is why I made the clause "rarely supported by Internet
software" -- it is rather an interesting and rarely known feature is SMTP.
In this scenario, IIS SMTP's inability to validate such recipient certainly
makes sense. BTW it still accepts such sender address. Also accepts the
recipient in IP-style if relaying is allowed, but then cannot deliver for
(based on a quick test).

Peter

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