# Blocked email messages

*Email Deliverability*. A temporary rejection of messages sent from your IP address.
Based on its content, an ISP or messaging organization might add your IP address to a blocklist.

An email message might get blocked because the recipient's inbox is full.

To learn how to discover and remedy blocked messages, see [Manage blocked messages](/docs/sendgrid/ui/sending-email/blocks) and the [Blocks API reference](/docs/sendgrid/api-reference/blocks-api).

## Additional entries

* [Bounce](/docs/sendgrid/glossary/bounces/)
* [Deferrals](/docs/sendgrid/glossary/deferrals)
* [Spam](/docs/sendgrid/glossary/spam/)
* [Spam Filter](/docs/sendgrid/glossary/spam-filter/)
* [Spam Reports](/docs/sendgrid/glossary/spam-reports/)
* [Spam Trap](/docs/sendgrid/glossary/spam-traps/)