do you need captcha validation in newsletter subscription?

Question

I am using a custom captcha php script along with news letter scripts to let users subscribe using an email id. The method of registration is based on jQuery.post command.

My question is that am I really safe If I remove the captcha validation from my subscription script. The subscription is simple. For example

mydomain/[email protected]

The subscribe.php is called along with email as parameter using jQuery.post command. I am new to web programming stuff and don't have much idea about spammers in conjunction with above scenario. Any advise would greatly be appreciated.

Thanks

Answer 1

Spambots fill out every form they can get their hands on.

I receive subscriptions from bots everyday and I'm slowly adding captchas to all forms.

A bot does not know if the form he is filling out is for a subscription, a contact form or a mass mailing opportunity.

If you don't protect yourself by either using captchas or moving some of the logic into javascript functions, you will send emails to all these addresses.

This increases your traffic, decreases your control over your subscribers, makes a mess out of your stats and sometimes you might send an email to users that didn't want to subscribe because a bot has subscribed thru a trick (i.e. [email protected] also reaches the user [email protected]).

So my advise: stay with the captcha Or: modify your form to make more use of javascript (i.e. load the form via ajax), because bots are not normal users with a browser, they only simulate them

Answer 2

From the answers that I have read only the one from favo is really true. A spambot is a computer program that most likely goes one by one in google and searches your page for any input box and submit button.

I have experience with spam and my subscriptions but adding a capcha can get you less subscriptions. Take it off for now and if you can moderate the emails before adding them to to the mailing list. If you see you are getting to much spam then go ahead and put up the capcha. But really one or two spam emails a week is normal.

So, I recommend moderation until it gets ridiculous.