+++
title = 'BugBounty 101: Email Subscriptions'
date = 2024-12-18
+++

The most common vuln in email subscription that I've seen is spamming:

If you found any email subscription form, try to spam yourself by subscribing multiple times:

```sh
email@example.com (your original mail box)
email+random1@example.com (messages will be sent to 'email@example.com')
email+random2@example.com
...
```

Why company don't want it? It's possible to use this vuln to make all their emails appear in spam folder by-default by spamming innocent users which will report it as spam. 

Other email hacks:  
https://book.hacktricks.xyz/pentesting-web/email-injections