The trade-offs are acceptable losses, in my opinion. I like the illustration at
http://spf.pobox.com/mailflows.html. I don't think SRS is necessary.
Web-generated mail (e-cards) can be delivered in a different form, such as
personally sending a link to a web page and people can just POP the forwarding
service directly, instead of having the mail forwarded.
Sender Policy Framework: http://spf.pobox.com/
Archives at http://archives.listbox.com/spf-discuss/current/
Read the whitepaper! http://spf.pobox.com/whitepaper.pdf
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