I installed SPISP which seems to be working. I'd like to be able to test it. Is there any way to test it. When I forwarded mail messages that were identified as spam from my other mail accounts they were not detected as spam by SFISP. I am guessing this is because forwarding from a credible account (i.e. not from a spammer ISP).

Also, while I was testing your software I sent a number of messages and consequently I think my ISP's Ip was placed in your black list. I am guessing the from the following message that I receive from that ISP's mail:

.net 007: This e-mail message was undeliverable due to the
following reason:

.net 016: The destination mail system refused to accept your e-mail
message.

Note: This error message is usually due to the following:
a. A mis-configured account.
b. The mail delivery system on the destination mail system.
c. It could be caused by your message because some mail systems refuse
messages with invalid header information, or if they are over a certain
size.

Solution 1:
If this is the first time the destination mail system refused to accept
your e-mail message, attempt to resend the e-mail message again.

Solution 2:
If the destination mail system has refused to accept your e-mail message
multiple times, attempt to resend, or contact the recipient by alternate
means and let them know about the issue.

Your message was rejected by modomain.com for the following reason:

Your IP 205.152.59.66 is currently listed in SpamFilter ISP's Distributed Blacklist. Please see http://www.logsat.com/SFDB/why.asp for details.

The following recipients did not receive this message:

user@domain.com