QUOTE(DavidT @ Sep 22 2006, 10:04 AM)

I'm not sure I understand what you're doing with your SpamCop mail. The three ways that I access my SpamCop email account are either by using an email client on my PC (Pegaus) to POP the mail directly from "mail.spamcop.net" or by using the same program to view my mail using IMAP on "imap.spamcop.net" or by using a browser to connect to "webmail.spamcop.net." I can't imagine an ISP blocking any of that, so maybe you're forwarding the mail that arrives at your SpamCop account to a mailbox on your local ISP? I don't understand why you would want to do that.
DT
David: You can also have spamcop forward all good messages (or all messages in tagging mode) to an alternate address. This appears to be what he is doing.
Petzl: Perhaps Tero has a good reason for wanting messages forwarded to his ISP account.
Suggesting these alternatives is good, but not answering Tero's question.
Tero: I do not forward, so I do know know what servers are used for that. To get an authoratative answer, you woul dneed to contact JT (support[at]spamcop.net).
Another work around would be to send your Yahoo messages directly to your ISP account.
This is one of the known problems with SPF, you can not use a forwarding service if the receiver is checking for it. The message is saying it came from Yahoo, Yahoo has SPF records indicating the servers this message is valid for. The message, after redirection, is coming from a different server and is rejected.