If a major ISP (like AOL, or MSN/Hotmail, Yahoo! or SpamCop) is blocking your
emails, this is actually not that unusual. The major ISPs usually block emails
temporarily and then remove the servers from the blacklist within a day or two.
Please note that Benchmark is on so many feedback loops with major ISPs that we
usually already know when this happens, and we re-route emails to other outgoing
email servers until the issue is cleared up. We also investigate the user that
caused the problem, and boot them if we feel they're doing too much harm or violating
our terms of use.
But if you happen to see a major ISP blocking Benchmark in your SMTP headers,
it helps if you contact us immediately. We can then contact that ISP and work
things out with them directly.