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sendmail configured but mail sent is always filtered as junk

Posted on 2004-04-19
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Last Modified: 2013-12-17
I have sendmail configured, but all mails I send to yahoo are filtered to bulk.  this is what I need help with.  I need a way to configure sendmail so any email I send to yahoo or other email customers is not filtered as bulk.

I have the domain I registered from www.no-ip.com and have added it to my hosts table.  When email is sent EHLO is identifyed as my domain.  And a rDNS on this domain matches the ip of the connection.  I cannot see any reason to be considered junk.  But yahoo says it is.  Aditioanly my ip is not blacklisted as the ORDB does not list me.

I have the domain from no-ip.com but I also have a domain automaticaly assigned to my by my ISP's DHCP server.  my hosts file contains both domains.

Composeing a new mail on the same machine as the sendmail daemon, and sending to a yahoo account:

From Kelly Mandrake Mon Apr 19 15:49:00 2004      
X-Apparently-To: atapi103@yahoo.ca via 216.136.232.73; Mon, 19 Apr 2004 15:48:14 -0700      
X-YahooFilteredBulk: 24.101.x.x      
Return-Path: <admin@atapi103.spoofed.org>      
Received: from 24.101.x.x (EHLO atapi103.spoofed.org) (24.101.x.x) by mta193.mail.dcn.yahoo.com with SMTP; Mon, 19 Apr 2004 15:48:13 -0700      
Received: from [127.0.0.1] (CPE0080c6fe15a9-CM014480118888 [127.0.0.1]) by atapi103.spoofed.org (8.12.10/8.12.10) with ESMTP id i3JMn0Im005820 for <atapi103@yahoo.ca>; Mon, 19 Apr 2004 18:49:11 -0400      
Subject: Yahoo Test 1      
From: "Kelly Mandrake" <admin@atapi103.spoofed.org>      
To: atapi103@yahoo.ca      
Content-Type: text/plain      
Message-Id: <1082414940.5806.1.camel@CPE0080c6fe15a9-CM014480118888>      
Mime-Version: 1.0      
X-Mailer: Ximian Evolution 1.4.5 (1.4.5-7)       
Date: Mon, 19 Apr 2004 18:49:00 -0400      
Content-Transfer-Encoding: 7bit      
Content-Length:      16

Why is this considered junk and how do I configure sendmail so I can send to yahoo without being persived as junk?
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Question by:spinestmains
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8 Comments
 

Author Comment

by:spinestmains
ID: 10865435
Get rid of the host name given to me by DHCP and now I only have one hostname, that is the one provided by no-ip.com (atapi103.spoofed.org)

Once again 24.101.x.x and atapi103.spoofed.org is not blacklisted in the ORDB

But the following is still going to my junk folder:

From Kelly Mandrake Mon Apr 19 19:34:26 2004      
X-Apparently-To: atapi103@yahoo.ca via 66.163.170.211; Mon, 19 Apr 2004 19:33:28 -0700      
X-YahooFilteredBulk:      24.101.x.x
Return-Path: <admin@atapi103.spoofed.org>      
Received: from 24.101.x.x (EHLO atapi103.spoofed.org) (24.101.x.x) by mta177.mail.dcn.yahoo.com with SMTP; Mon, 19 Apr 2004 19:33:28 -0700      
Received: from [127.0.0.1] (atapi103.spoofed.org [127.0.0.1]) by atapi103.spoofed.org (8.12.10/8.12.10) with ESMTP id i3K2YQmL004642 for <atapi103@yahoo.ca>; Mon, 19 Apr 2004 22:34:26 -0400      
Subject: Yester Tester      
From: "Kelly Mandrake" <admin@atapi103.spoofed.org>  Add to Address Book      
To: atapi103@yahoo.ca      
Content-Type: text/plain      
Message-Id: <1082428465.4631.0.camel@atapi103.spoofed.org>      
Mime-Version: 1.0      
X-Mailer: Ximian Evolution 1.4.5 (1.4.5-7)       
Date:      Mon, 19 Apr 2004 22:34:26 -0400      
Content-Transfer-Encoding: 7bit      
Content-Length:      12
0
 
LVL 40

Expert Comment

by:jlevie
ID: 10865950
I can think of two reasons why this is happening:

1) The IP of your system is one that Yahoo recognizes as being a "dialup IP"

2) A reverse lookup of your IP doesn't match the professed hostname of your mail server.

Certainly for (1) and probably for (2) the only solution is going to be to use your ISP's mail server as an outgoing relay. Sites like Yahoo, Hotmail, etc do this as a measure of spam control. Using your  ISP as a relay is easily done by including:

define(`SMART_HOST',`mail.my-isp.net')dnl

in sendmail.mc and building a new sendmail.cf. If your internet link were to be "commercial account" and you hosted your domain with your ISP both causes would go away. However, in most cases "commercial accounts" are significantly more expensive that ordinary dialup accounts, which it appears that you have.
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Author Comment

by:spinestmains
ID: 10871751
it isnt a dialup acount, its a broadband cable account, my ip is static.

I thought they would do a reverse dns of the hostname and try to match it with the ip of the connection, but I guess what you are trying to say is they also lookup the ip and try to match with the hostname.  So there is no other way around this but to use my ISP's smtp server for sending?

If I am a new comapny starting a buisness provideing email service to people, how would I go abouts doing this then.  My ISP rogers must have started somehow, they provide mail services, internet services and tv cable services.  Guess what I am trying to say is I understand what you say that I need to use my ISP smtp server for outgoing to avoid being bulk mail, but how is my ISP able to get around this?
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LVL 40

Accepted Solution

by:
jlevie earned 125 total points
ID: 10872862
"dialup" in this context doesn't mean a modem and phone line but instead refers to the type of service. And by that I mean a private, or residential, type of service as opposed to a commercial account with your ISP. As an example I have a residential DSL) account with my provider, billed at something like $50US/mo. The IP that I get is static, but it is listed in the dialup black lists. If I wanted, my provider would be quite happy to set me up with a commercial account, out of different block of IP's that aren't "dialup" IP's) for a significantly higher cost ($300US/mo minimum).
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Author Comment

by:spinestmains
ID: 10873076
ok so my ip and my domain assigned by my ISP is black listed by yahoo and possibly other providers of email services  to prevent home users not paying the extra money, from setting up such email systems.  Well that is quite intelegent, oh well I guess I have no choice but to use the smart_host rule you discribed above.

I thank you for explaining this process to me and although the outcome was grim, I learned much and for that here are the points.  Im not gona bother uing my isp's smtp and instead will use only my pop for private incomeing emails and figureout something else for the outgoing.
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LVL 40

Expert Comment

by:jlevie
ID: 10873649
It isn't a "scheme devised by the ISP's" but rather it is a reflection that the majority of the spam and viruses originate from those "dialup" IP's. I'd be extremely happy if every IP used by a non-commercial type account were to be known so that I could reliably block mail from those IP's. On one of the servers I manage that would reduce the amount of mail it has to handle by 60% and reduce the spam volume by about 90% and viruses by about 70%.

There's no problem in starting your own email service without running afoul for the dialup IP black lists, it justs costs a bit more that you were anticipating.
0
 

Author Comment

by:spinestmains
ID: 10874691
Ive been thinking for a while of switching to Vif Internet as my ISP, they seem to be accepting of customers who run  servers, my current ISP has a TOS against server running, and I guess like you say with some extra money they would let me but it seems now to be a more cost effective option over at VIF, I personaly wrote them a query regaring their ASDL home service and users who run servers.  If they take the baite I will switch over to Vif.

it would dobule the speed I am getting now anyway, my ISP I pay about 50 dollars with all taxes/month, at a connection rated for 1.5Mbps download, where Vif offers what apears to be 3Mbps for aproxamitly same price after modem rental.

0
 
LVL 40

Expert Comment

by:jlevie
ID: 10874760
that does sound like a good deal, especially the doubling of download speed at essentially the same price.
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