E.g. Software that "auto-updates" cannot solve the problem of how different participants change their criteria on which ip blocks are "bad".
But I'm not completely convinced. Sender reputation is made up of at least two parts: the software (rules) used to send the emails, AND the actual emails sent, frequency of emails and number of unique recipients.
If you're a spammer you can still use the same software as everyone else, but your reputation will be bad because of the number of bad emails you sent.
In other words, if everyone used the same software to send emails, then anti-spam systems will have to use other metrics to blacklist people.
Right, and the "other metrics" is what spam heuristics already use now.
In other words, you replied to this author's problem with "self-updating software" but software cannot solve his outgoing email getting rejected/spamholed. It's those "other metrics" that made him give up running his mailserver from home.
