Prevent spam via contact form

John M · Share | #1 (**permalink**) 04-26-2007, 02:26 AM

I´m getting spam via my contact form on my website. Do you know how to prevent this?

kos · #2 (**permalink**) 04-26-2007, 05:55 AM

consider these posibilities:

- beeing the site owner, your spammed e-mail is admin@..., webmaster@..., contact@..., office@...and so on; these are easy to guess;
- maybe your e-mail address is beeing shown elsewhere on your site;
- check if you use "mailto:youremailaddress@..." on your forms;

John M · #3 (**permalink**) 05-06-2007, 02:34 AM

Quote:

Originally Posted by costin_trifan

consider these posibilities:

- beeing the site owner, your spammed e-mail is admin@..., webmaster@..., contact@..., office@...and so on; these are easy to guess;
- maybe your e-mail address is beeing shown elsewhere on your site;
- check if you use "mailto:youremailaddress@..." on your forms;

This is not the problem. The problem is that a robot uses my contact form to send me spam. How can i prevent the robot from sending me spam?

kos · #4 (**permalink**) 05-06-2007, 07:14 AM

...searching the web to find a list of all bad bots;
After that add in your robots.txt as follows:

User-agent: http://www.almaden.ibm.com/cs/crawler
Disallow: /

User-agent: NPBot
Disallow: /

User-agent: TurnitinBot
Disallow: /

User-agent: EmailCollector
Disallow: /

User-agent: EmailWolf
Disallow: /

User-agent: CopyRightCheck
Disallow: /

User-agent: Black Hole
Disallow: /

User-agent: Titan
Disallow: /

User-agent: NetMechanic
Disallow: /

User-agent: CherryPicker
Disallow: /

User-agent: EmailSiphon
Disallow: /

User-agent: WebBandit
Disallow: /

User-agent: Crescent
Disallow: /

User-agent: NICErsPRO
Disallow: /

User-agent: SiteSnagger
Disallow: /

User-agent: ProWebWalker
Disallow: /

User-agent: CheeseBot
Disallow: /

User-agent: ia_archiver
Disallow: /

User-agent: ia_archiver/1.6
Disallow: /

User-agent: Teleport
Disallow: /

User-agent: TeleportPro
Disallow: /

User-agent: Wget
Disallow: /

User-agent: MIIxpc
Disallow: /

User-agent: Telesoft
Disallow: /

User-agent: Website Quester
Disallow: /

User-agent: WebZip
Disallow: /

User-agent: moget/2.1
Disallow: /

User-agent: WebZip/4.0
Disallow: /

User-agent: Mister PiX
Disallow: /

User-agent: WebStripper
Disallow: /

User-agent: WebSauger
Disallow: /

User-agent: WebCopier
Disallow: /

User-agent: NetAnts
Disallow: /

User-agent: WebAuto
Disallow: /

User-agent: TheNomad
Disallow: /

User-agent: WWW-Collector-E
Disallow: /

User-agent: RMA
Disallow: /

User-agent: libWeb/clsHTTP
Disallow: /

User-agent: asterias
Disallow: /

User-agent: httplib
Disallow: /

User-agent: turingos
Disallow: /

User-agent: spanner
Disallow: /

User-agent: InfoNaviRobot
Disallow: /

User-agent: Harvest/1.5
Disallow: /

User-agent: Bullseye/1.0
Disallow: /

User-agent: Mozilla/4.0 (compatible; BullsEye; Windows 95)
Disallow: /

User-agent: Crescent Internet ToolPak HTTP OLE Control v.1.0
Disallow: /

User-agent: CherryPickerSE/1.0
Disallow: /

User-agent: CherryPickerElite/1.0
Disallow: /

User-agent: WebBandit/3.50
Disallow: /

User-agent: DittoSpyder
Disallow: /

User-agent: SpankBot
Disallow: /

User-agent: BotALot
Disallow: /

User-agent: lwp-trivial/1.34
Disallow: /

User-agent: lwp-trivial
Disallow: /

User-agent: Wget/1.6
Disallow: /

User-agent: BunnySlippers
Disallow: /

User-agent: URLy Warning
Disallow: /

User-agent: Wget/1.5.3
Disallow: /

User-agent: LinkWalker
Disallow: /

User-agent: cosmos
Disallow: /

User-agent: moget
Disallow: /

User-agent: hloader
Disallow: /

User-agent: humanlinks
Disallow: /

User-agent: LinkextractorPro
Disallow: /

User-agent: Offline Explorer
Disallow: /

User-agent: Mata Hari
Disallow: /

User-agent: LexiBot
Disallow: /

User-agent: Web Image Collector
Disallow: /

User-agent: The Intraformant
Disallow: /

User-agent: True_Robot/1.0
Disallow: /

User-agent: True_Robot
Disallow: /

User-agent: BlowFish/1.0
Disallow: /

User-agent: JennyBot
Disallow: /

User-agent: MIIxpc/4.2
Disallow: /

User-agent: BuiltBotTough
Disallow: /

User-agent: ProPowerBot/2.14
Disallow: /

User-agent: BackDoorBot/1.0
Disallow: /

User-agent: toCrawl/UrlDispatcher
Disallow: /

User-agent: WebEnhancer
Disallow: /

User-agent: TightTwatBot
Disallow: /

User-agent: suzuran
Disallow: /

User-agent: VCI WebViewer VCI WebViewer Win32
Disallow: /

User-agent: VCI
Disallow: /

User-agent: Szukacz/1.4
Disallow: /

User-agent: QueryN Metasearch
Disallow: /

User-agent: Openfind data gathere
Disallow: /

User-agent: Openfind
Disallow: /

User-agent: Xenu's Link Sleuth 1.1c
Disallow: /

User-agent: Xenu's
Disallow: /

User-agent: Zeus
Disallow: /

User-agent: RepoMonkey Bait & Tackle/v1.01
Disallow: /

User-agent: RepoMonkey
Disallow: /

User-agent: Zeus 32297 Webster Pro V2.9 Win32
Disallow: /

User-agent: Webster Pro
Disallow: /

User-agent: EroCrawler
Disallow: /

User-agent: LinkScan/8.1a Unix
Disallow: /

User-agent: Kenjin Spider
Disallow: /

User-agent: Keyword Density/0.9
Disallow: /

User-agent: Cegbfeieh
Disallow: /

This is a small list

you can add more

jesse1 · #5 (**permalink**) 05-09-2007, 04:26 AM

put a simple check box like:

check here if you are a human

and make that verify...or use a catchpa

John M · #6 (**permalink**) 05-10-2007, 04:29 AM

Quote:

Originally Posted by jesse1

put a simple check box like:

check here if you are a human

and make that verify...or use a catchpa

I used the checkbox, i still got spam

Ferre · #7 (**permalink**) 05-10-2007, 05:28 AM

Since a while I use this form here:

http://green-beast.com/blog/?page_id=71

No spam gets through in my experience. And there's a 'wordpress plugin' version too.

Mad Myche · #8 (**permalink**) 05-11-2007, 01:40 PM

Good old form spam.

I did a cheeze CAPTCHA with a static image, server side verified the response