AOL blocking MailScanner messages!

Julian Field mailscanner at
Fri Dec 5 16:47:30 GMT 2003

At 16:22 05/12/2003, you wrote:
>Hi people,
>I have been reading a lot of posts about this issue and I wandering
>about something.
>A lot of people here in Brazil use broadband connections like xDSL and
>so to implement their own MTA and use it to send spam and other bulk
>email. Let say, if a local ISP provides a dynamic IP address to you like
> you can easily get it?s reverse DNS name which is

In which case use one of the DULs as a blacklist. These contain all the
known dial-up IP addresses, so you can just reject mail that hasn't been
sent through their ISP's mail server.

>Well to me this M4 ruleset doen?t help at all, because I wouldn?t be
>rejecting mail coming from these addresses. I get an average spam of
>300+ a day coming from these type of addresses. I think that if we do in
>fact reject mail based on RDNS we are just forcing those who have a
>bronken DNS configuration to fix their RR records, that?s all.
>I am just trying to share my point of veiw (if in fact I am right about
>it). But than again this is going to be way OT here.
>Feel free to send me PVT email anyone who wants to discuss this any
>further with me.
>Best regards to all.
>>>>However, this has nothing to do with RDNS at all, and nothing to do
>>>>what AOL is doing. AOL is implementing refusal of mail from servers
>>>>that do
>>>>not have a reverse DNS lookup for their IP. It's not rocket science
>>>>to do
>>>>in sendmail, i.e. something like this:

Julian Field
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