1. Usage: Mailinator is mainly used for receiving public and temporary emails for testing and not for sending emails. On the other hand, Mailtrap provides a simulated SMTP server for testing email sending and receiving, allowing users to test their email workflow comprehensively.
2. Email Storage: Mailinator offers unlimited email storage, but emails are publicly accessible for anyone to view. In contrast, Mailtrap provides a private and secure environment for storing emails, ensuring data privacy and confidentiality.
3. Email Deliverability: Mailinator does not guarantee email deliverability to any specific recipient, making it unsuitable for testing email sending. In comparison, Mailtrap allows users to send test emails to specific addresses and ensure their proper delivery.
4. Spam Filtering: Mailinator does not filter spam emails, as it is designed for public and temporary email use. Conversely, Mailtrap filters out spam and unwanted emails, providing users with a clean inbox for efficient testing.
5. Integration: Mailinator lacks robust integration options with other tools and services, limiting its usability for automated testing workflows. Meanwhile, Mailtrap offers various integration options with popular development tools and frameworks, facilitating seamless email testing in different workflows.
6. Collaboration: Mailinator does not support team collaboration features, making it challenging for multiple users to work together on email testing tasks. In contrast, Mailtrap allows team members to collaborate on testing projects, enhancing efficiency and productivity in email testing processes.

In Summary, the key differences between Mailinator and Mailtrap lie in their usage, email storage, deliverability, spam filtering, integration, and collaboration features.