Blocking form spam

This WebDNA talk-list message is from

2006


It keeps the original formatting.
numero = 67907
interpreted = N
texte = Hi, =20 A couple of my sites are starting to get hit by bots that are sending spam through contact and sign-up forms. I can't use CAPTCHAS on some of these forms and was wondering what techniques others are using to try and block this stuff. =20 Also on some forms the spammers are adding email headers hoping to push email through if any of the form fields are passed on to sendmail. I have read that the way to block this is to strip linefeed and carraige return characters out of the fields. The best that I have come up with is:- =20 [table name=3Dremovelinefeeds&fields=3Dfrom,to] %0A=20 %0D=20 [/table] =20 [text]_cleanname=3D[convertwords table=3Dremovelinefeeds][_name][/convertwords][/text] =20 Does anyone have a neater way to strip these characters ? =20 =20 Thanks - Tom ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/ Associated Messages, from the most recent to the oldest:

    
  1. Re: Blocking form spam ( Stuart Tremain 2006)
  2. Re: Blocking form spam ( Terry Wilson 2006)
  3. Re: Blocking form spam ( Stuart Tremain 2006)
  4. Re: Blocking form spam ( "Tom Duke" 2006)
  5. Re: Blocking form spam ( Stuart Tremain 2006)
  6. Re: Blocking form spam ( WJ Starck 2006)
  7. Re: Blocking form spam ( Gary Krockover 2006)
  8. Re: Blocking form spam ( Donovan Brooke 2006)
  9. Re: Blocking form spam ( "Brian B. Burton" 2006)
  10. Re: Blocking form spam ( WJ Starck 2006)
  11. Re: Blocking form spam ( Terry Wilson 2006)
  12. Re: Blocking form spam ( Stuart Tremain 2006)
  13. Blocking form spam ( "Tom Duke" 2006)
Hi, =20 A couple of my sites are starting to get hit by bots that are sending spam through contact and sign-up forms. I can't use CAPTCHAS on some of these forms and was wondering what techniques others are using to try and block this stuff. =20 Also on some forms the spammers are adding email headers hoping to push email through if any of the form fields are passed on to sendmail. I have read that the way to block this is to strip linefeed and carraige return characters out of the fields. The best that I have come up with is:- =20 [table name=3Dremovelinefeeds&fields=3Dfrom,to] %0A=20 %0D=20 [/table] =20 [text]_cleanname=3D[convertwords table=3Dremovelinefeeds][_name][/convertwords][/text] =20 Does anyone have a neater way to strip these characters ? =20 =20 Thanks - Tom ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/ "Tom Duke"

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