All code can be triggered via email (docs), i.e. maas.forwarder@valtown.email. You can generate as many emails as you want to avoid giving away your personal email address and reduce spam.

0. Log in to Val Town
1. Fork this Val
2. Publish the Val via 🔒 > Unlisted
3. Copy the email endpoint via ⋮ > Endpoints > Copy email address
4. Sign up for newsletters or services using this email (maas.forwarder@valtown.email).

To remove their ability to email you, simply delete the val (or send it to /dev/null).