I have run into this myself. It is very annoying. Of course if the ISPs would actually monitor their own nets and be responsive to accurate detailed reports of actual open relay servers and other obvious abuse on their own networks, this kind on non-sense would be unnecessary. Quite frankly I find this worst then the spam. The ISP that I use will not even accept mail from their own hosts. This shows how little they grasp of their own business. Anti-Spam measures should be left up to the end users IMO. Maybe I like receiving Spam, maybe that's why I want a High-Speed Internet Connection. ISP stands for Internet Service Provider. To me that means the whole internet. I have an ISA server to block what I don't want which is the whole point, if someone wants less than the whole internet that should be up to them. Oh Well Bill -----Original Message----- From: Amy Babinchak [mailto:amy@xxxxxxxxxxxxxxxxxxxxxxxxxx] Sent: Tuesday, April 08, 2003 9:33 AM To: [ISAserver.org Discussion List] Subject: [isalist] RE: Exchnage server publising by ISA causing some emails been rejected. http://www.ISAserver.org Tom, It actually has to do with a combination of dynamically assigned IP address and using your own server for sending out email. They want those people that have dynamically assigned IP address to use the server provided by the ISP. From talking to them what they appear to have done is take the ranges of IP's that are assigned to the major ISP's out there and associated them with particular email servers. So if your IP and server don't match they don't accept the email. Supposedly this is an attempt to reduce spam. They say that people like me that use Comcast with a dynamic IP and an Exchange server are likely spammers. - I'M WRONGLY ACCUSED! I'M INNOCENT! - But no matter, I have to change my email settings to send mail out through Comcast's server if I want my mail to be delivered to an Earthlink customer. Fortunately I only have one of those. It's a business client and Earthlink is about to lose them to Megapath because of this. I understand what they are trying to accomplish but replacing one annoyance with another is not acceptable. Here's the message you get back from Earthlink with the bounced email and the links that explain what they are doing. Although the message also refers to open relay this was not the case on my server. Only the dynamic IP applied. There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <harbor.HCS.Local #5.5.0 smtp;550 Dynamic IPs/open relays blocked. Write <openrelay@xxxxxxxxxxxxxxxxxxx>.> Hello, The reason that your mail bounced back is because it appears to have attempted to pass directly from an IP address range believed to be dynamically assigned (such as cable, dialup or ADSL) to the EarthLink/MindSpring network), without first routing through an appropriate SMTP server. This is known as "Direct to MX mailing", and is a technique used by spammers to bypass spam control mechanisms established by ISPs. The following websites will help to explain the technicalities of what is going on and how to alter your settings to correct the situation. They are non-EarthLink resources. <http://pan-am.ca/pdl/> <http://www.mail-abuse.org/dul/enduser.htm> <http://www.iis.se/Internetdagarna/idag2000/spam/maps/dul.html> Amy -----Original Message----- From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx] Sent: Monday, April 07, 2003 8:55 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: Exchnage server publising by ISA causing some emails been rejected. http://www.ISAserver.org Hi Amy, Do you know if they are explitly denying inbound mail associated with tzo and dyndns? I'm not sure how they would know, since the reverse lookups on the dynamic ip address would not resolve to the ddns provider, but to the ISP's reverse lookup zone, if they even keep one for their dynamic addresses. Thanks! Tom Thomas W Shinder www.isaserver.org/shinder ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp -----Original Message----- From: Amy Babinchak [mailto:amy@xxxxxxxxxxxxxxxxxxxxxxxxxx] Sent: Monday, April 07, 2003 11:18 AM To: [ISAserver.org Discussion List] Subject: [isalist] RE: Exchnage server publising by ISA causing some emails been rejected. http://www.ISAserver.org Are you by chance hosted with Earthlink? If so, anyone sending you mail from a non-static IP may have trouble depending on how they are configured. This is a new attempt on their part to avoid spam. Amy -----Original Message----- From: Martin Chen [mailto:martinhr@xxxxxxxxxxxxxx] Sent: Monday, April 07, 2003 10:49 AM To: [ISAserver.org Discussion List] Subject: [isalist] Exchnage server publising by ISA causing some emails been rejected. http://www.ISAserver.org Dear all, Did anyone ever had a problem that some emails from specific domains were always been bounced back. These domains can received email sending from our server. But they can't send email to us. Some domains will get a error message but some domain will receive nothing ( the email is gone without any notice). I'm using ISA sp1 ( I using the first version sp1 last year. Then I found lots of mail been bounced back. Then I using newest sp1, it fix some domains' emails. But not all of them. My email server is Exchange 2k with sp2 and Win2k server with sp3. Thanks! 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