: Why am I getting random comments with just "door.txt;10" as the content? I have my own comment system with some rudimentary spam protection. Recently I started getting a few comments that appear

@Jessie594

Things like that are test strings used by spam bots to verify if your commenting system is susceptible to attack. If your commenting systems displays the message bot instantly marks it as target. Additional checks are often made later on to see for how long did message last, and if your site still can be targeted.

Best prevention method would be either to use some form of basic CAPTCHA (not necessarily reCaptcha, as it was cracked several times already and currently is one of most frustrating captchas for end-users), or user tracking through session (eg. you cannot write message in under 10 second from loading the page) - perhaps with additional "blacklist" of words that will forbid posting the message.

It's not 100% secure, but definitely will discourage most of basic spambots (it won't defend you from a directed attacks though.

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