Stop SPF rejection of e-mails I send

This isn't an Agaric request – Agaric hasn't had this problem – this is a Ben request. How do I stop my e-mail from SPF bouncing?

I just want to send my e-mail and have it get where its going. I want to be able to send my pwgd.org e-mail through my melanconent.com server. I want to be able to send both plus agaricdesign.com through the former and through rcn.com's SMTP, comcast.com's SMTP, and verizon.com's SMTP.

Is this so much to ask?

Are there no true SPF wizards out there?

http://old.openspf.org/wizard.html

Some guy who did a hell of a lot of research on his own, but no answers.

http://hostpc.com/community/archive/index.php/t-2218.html

Here are the problem rejected e-mails:

The following message to was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 554-'refused mailfrom because of SPF policy'

Final-Recipient: rfc822;janet@example.com
Action: failed
Status: 5.0.0 (permanent failure)
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 554-'refused mailfrom because of SPF policy' (delivery attempts: 0)
Reporting-MTA: dns; smtp02.lnh.mail.rcn.net

The following message to was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 554-'refused mailfrom because of SPF policy'

Final-Recipient: rfc822;jenner@example2.com
Action: failed
Status: 5.0.0 (permanent failure)
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 554-'refused mailfrom because of SPF policy' (delivery attempts: 0)
Reporting-MTA: dns; smtp02.lnh.mail.rcn.net

Resolution