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Re: People forging their From: addresses
- Date: Wed, 30 Sep 1998 11:35:26 +0200
- Organization: Rekencentrum TU Delft
Nate Waddoups wrote: > ... > I cannot help but wonder why spammers choose to use legitimate domain > names when they forge "From" headers. What good could it possibly do > them, as opposed to just using something that doesn't exist? > Puzzling. A lot of e-mail systems check the from-address for existance. If this address does not exist the message is not accepted. Unfortunately a lot of these e-mail systems use the wrong return code. When the domain does not exist they should permanently reject the message; in SMTP-terms an 500 error code should be given, however often a 400 error code is given. This 400 error code should only be given in case the DNS system is not responding on the request. fr.gr. Freek de Kruijf e-mail: F.deKruijf@localhost Rekencentrum TU Delft tel. 015 278 3226 fax 015 2783787 Postbus 354 M. de Ruyterweg 10-12 2600 AJ Delft 2628 BA Delft
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