To test a spam filter, you can use this string: XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X in the body of your email.
- Create account on pastepixel.com (https://grabify.link is also an option)
- Go on outlook.com
- Add module "insert html" by designmodo
- paste html code
<img src="https://pastepixel.com/image/....png" alt=""/> - Send email to yourself