Most email-sending IPs Have Bad Reputation

The reputations of 97 out of 100 email-sending IP addresses are bad enough that email providers would likely block their messages, according to an email study.

A mere 0.9 percent of IP addresses score high enough to ensure that emails they send would likely be delivered, according to a study by email deliverability services firm Return Path, Directmag.com reports (via MarketingVox). Luckily, most commercial marketers' IP addresses are within that 0.9 percent. However, their "Sender Score," as monitored by Return Path, tends to be closer to the borderline 70 than the highest-level 100.

Return Path uses six criteria (e.g., complaint rates, email volume sent, unknown-user rates) to assign each address a 1-100 score. Senders with scores above 70 would likely have their email delivered; those below 30 likely wouldn't. The highest-scoring IP addresses tend to be corporate accounts that don't send much email and don't spam.

"Most marketers are between 60 and 80," George Bilbrey, general manager of Return Path's delivery assurance solutions unit, is quoted as saying. "Most marketers are in the gray area. The question is: How gray are you and how can you get yourself to a lighter shade of gray?" The answer lies more in reputation and less in email content, he says.

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[Thomas]

It's definetly impossible to run a high rep e-mail server these days unless you dedicate a whole business to it.
I run a few mail servers usually on webservers to send out registration e-mails and site updates.
I send out a reminder to inactive users every month (with an opt out/account deletion option of course). Those go down surprisingly well (probably because they end up in the spam folder most of the time anyway. ;)
The crazy part is, about 1% of account activation e-mails are reported as spam. How stupid is that? People sign up for a website, get an e-mail to confirm their account, and call it SPAM? :-o

I remove invalid addresses immediately and honor every removal request. I have SPF records and participate in MSNs reporting program. Yet my e-mails go straight to the spam folder at hotmail and yahoo. Hotmail even dropped my mails without a bounce for weeks.

Personally I use spamassassin. I get close to 10k spam e-mails a day and spamassassin filters over 99% reliably with close to no false positives. The only false positives are usually automated e-mails, where the owner did not even bother to set a correct reverse DNS or add a real name to the sender address.
If I can filter spam reliably with an out-of-the-box GNU installation, why can't hotmail or yahoo do it? They use hellishly complex and expensive filters just to lose a boatload of legit e-mail.
People are stupid.