Tech Support Pits column from  Dear Webby's Humor Letter
widely read, forwarded, copied and imitated daily since 1994
Dear Webby's Humor Letter, daily since 1994

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DearWebby is actually Helmut Morscher, the CEO of Webby, inc.

Originally the "Tech Support Pits" were reports of the funniest tech support incidents, but over the years the column gradually shifted to answering tech support questions put forward by the readers of the Dear Webby Humor Letter.

This collection of computer and web advice was started partly because readers demanded an archive, and partly because some questions were asked again and again. Each page has a different day's Tech Support Pits column.

Have FUN!
Tech Support Pits column from Dear Webby's Humor Letter of
08/26/04: Reverse resolution

Tech Support Pits:
From Cory=== Dear Webby, What's reverse resolution all about ? Cory Dear Cory Reverse DNS tracking is a way to locate a legitimate server, or to determine if a mail is probably from an illegitimate server, like for example from a spammer. Reverse DNS backtracks not from you, but from the root of the Internet as far as possible to the sender of a mail. If it arrives at the sender, and identifies the sending server, then the mail is usually legit. If the trace stops or runs out, then the IP number uses as the apparent origin of the mail Has been forged, or the sending server is not 100% legit. Some shady ISPs sell unused capacity to spammers to pay for their dope bills, and naturally they don't want reverse tracing of spam to point straight at them. For that reason they don't set up their servers to be found with reverse resolution. That fact is quite commonly used for blocking spam. If a sending server has no reverse resolution, then that server is automatically blacklisted and mail from it winds up in the trash. It's the equivalent of slamming the phone on people who have paid extra to have their name or number hidden from a phone's call display. If you want to check the reverse DNS resolution of any e-mail, view the header of that e-mail and look for the originating IP number, copy it, and paste it into the REV DNS field at Have FUN Dear Webby
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