one of my clients is on a sketchy rural ISP that has managed to get itself - its entire /32 netblock - listed on sorbs (http://www.dnsbl.us.sorbs.net/)
FWIW, a /32 is exactly one address.
normally not a problem for someone using my server for smtp, but it means my clients couldn't send me email from their home account. so i took sorbs off my rbl list for a week and sent the ISPs tech support and admin addresses a note about getting de-listed.
now i appreciate sorbs even more than before. my personal account, with a normally low spam load, got slammed for a week. i have a half dozen other rbls in my list, and they're doing their part, but sorbs seems to be blocking the lion's share.
after the week, sorbs still had the netblock listed, so i put it into my "client host addresses" list. yay, they can send me mail again.
but, doesn't this also mean that anybody in that netblock can use my server to relay?
Yes, but if it is a /32, i.e. one address, that is likely to not be an issue.
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Bill Cole [EMAIL PROTECTED]
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