DeFensy: Anti-Spam for Channels and Chats

You open the comments under a post and find ten ads promising "easy money". Sound familiar? DeFensy removes that junk on its own while you focus on content. 🛡

Clean comments without hand moderation

DeFensy is an anti-spam bot for channels and groups. Its core job is stripping links and ads out of comments, and it also tackles flooding and fake activity.

The author has said that the first version took a couple of days to build, made to clear his own channels of link spam. It later grew into a full moderation tool.

What the protection covers

• Link and ad removal: the main case for channel comments.
• Anti-flood and anti-raid: defense against floods of identical messages and mass joins by bots.
• Captcha and greetings: checks on newcomers to filter out automated accounts.
• Stop words: a filter for unwanted expressions.
• Sleep mode: temporarily closes the chat to messages.
• Whitelists: exceptions for trusted people and approved links.

Some features may depend on a plan, so check the current terms inside the bot.

Setup in five steps

1. Open the bot and press /start, accepting the user agreement.
2. Add it to your channel or chat and make it an admin.
3. Grant the right to delete messages. Without it the filter cannot act.
4. Turn on the filters you need in the settings menu.
5. Test it: post a test link from a separate account.

For a channel with comments, the bot needs admin status both in the channel and in the linked discussion group.

Fake activity and multi-chat defense

Spam is not always an advertisement. Bots often drop identical replies in comments to inflate activity artificially. DeFensy also aims at that kind of manipulation.

If you run several chats, cross-ban helps: a violator blocked in one place cannot carry on as easily in the others.

Where it can miss

Every filter makes mistakes. A useful link from a real member can get deleted, so set up whitelists and review what the bot removes during the first days. ⚠️

• False positives: check the deleted items in the early days.
• Permissions: grant only what moderation needs.
• Rules: tell members that links in comments are not allowed.

The bot does not replace a human moderator. It takes the routine off your plate, and the gray cases stay with you.

Who gets the most out of it

Owners of channels with open comments, admins of big chats and anyone tired of deleting the same thing by hand. The bigger the audience, the bigger the time savings. 🙂

A small private chat of ten friends probably does not need this kind of protection.

The short version

DeFensy does one clear thing: it cleans comments of links and ads, and the extra tools cover typical admin headaches. Start with the basic filters and widen the protection step by step.