Mail Relay Blackholes to cut down on spamThis is targetted for email senders whose legitimate email has bounced with a message directing them to this page. ISPs whose customers have complained to them can find out how fix their problems on the open relay page.
spam. One of these is the use of databases of open relays, dialups and other spam sources. By not accepting email from sources within these databases, we have managed to reduce spam by about 75%. Unfortunately, a lot of spam still gets through. Our customers have asked us to do more to cut down on this spam. As a result, we have decided on a policy that will bounce email from some innocent/legitimate people to both cut down further on the spam and also to educate those people about the problems with their ISP.
Since spam isn't like junk snail mail where the sender bears the majority of the costs, but instead costs the receipient time and money for bandwidth(and possibly disk space), we hope that these measures help move the cost burden back to the ISPs that are lenient on or encourage spammers and therefore back to the spammers themselves.
To do this, we hope to increase our use of blackhole databases until we have received comments from our customers about end users who haven't been able to reach them.
the reasons stated above, we use several of these databases and thus won't accept mail from your server which has been identified as a source of spam.
Even if we allowed email from known sources of spam, others still wouldn't and so you would run into this problem earlier or later. We figured it would be best for you to make a conscious choice knowing the problems your ISP has and possibly vote with your checkbook by moving to another ISP where you won't have problems sending email.
Hotmail or Yahoo and send the email from there. Because of the potentialfor abuse(and past abuses), the free webmail accounts have better spam prevention policies than some ISPs.
This will allow you to send email to any of those who are blocking your ISP.
Each bounce will have an abbreviation appended to it. If you don't see that abbreviation below, email us, including the bounce message, because we must have added a database to the mail server and missed adding it here.
If not, you are probably in for a bit of work.
First you need to determine the likely mail servers for the ISP that your mail
would go through to the outside world.
You can ask friends who use the ISP, the ISP or go with the
likely servers. The likely servers are mail.ISPNAME and the servers listed as
Mail eXchangers(MXes) for the ISP. If you have access to nslookup, you can find the
mail exchangers by doing a
Next, you need to find the IP address for each of these mail servers.
Then go to the lists and check to see if that IP address is on a list. If none of the mail servers are on any of the lists, then the ISP is probably good.
If anyone wants to fund the creation of a CGI to automatically check an ISP for you, please let me know.
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