David Adams wrote:
> I had problems getting CFMAIL to work on my website.  It worked for some
> users and failed for others.  I thought it was a CF problem until I talked
> to a mail administrator of one of my users and he reported that mail coming
> from my website was denied because my ISP is known for being guilty of send
> out spam.
>  
> How do you check if you ISP is on the black list?

There is no such thing as "the black list". There are hundreds of them 
(even my university has its own). However, most will generate an error 
message that is comprehensible, such as:
"500 5.7.1 IP address [xxx.xxx.xxx.xxx] FormMail Spam Source BLOCKED: 
Contact Postmaster"
"500 5.7.1 IP address [xxx.xxx.xxx.xxx] BLOCKED: See
http://www.monkeys.com/anti-spam/filtering/proxies.html";
"500 5.7.1 IP address [xxx.xxx.xxx.xxx] E-mail refused. Reason 1. See
http://www.dto.tudelft.nl/blacklist.htm

So since there is no complete list, there is quite little you can do 
except make sure that whenever you hear something make sure you get the 
error message which will tell you which list blocked you.

The only other option is to install your own email server and make it 
check every blacklist you can find and start sending yourself email.

Jochem

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