All seacow.net servers implement SPF. Forged email will not be delivered.
You can take a look at a dynamically updated list of people trying to send forged email to seacow.net
In addition to the great Spamassassin blacklist provided by William Stearns
And the blacklist provided by Passwall Domains
seacow.net has created our own SPF validated blacklist
All email from any address on these lists will be automatically discarded.
Please contact the list owner for corrections.
Corrections to the seacow.net blacklist can be emailed to the postmaster (from a non-blacklisted address).A dynamically generated list of sites trying to relay email through seacow.net can be found at:
Relay Attempts
A dynamically generated list of forged email sent to seacow.net can be found at:
Forged Email

total messages = clean messages + spam messages + dropped messages
spam messages = SpamAssassin identified spam + blacklisted addresses
dropped messages = SPF forged messages + unresolved domains + pre-greet violations
clean messages = valid email