There are several methods you can employ to test your emails on multiple devices:
Manual Testing: Sending test emails to different devices you have access to. This method is straightforward but can be time-consuming and may not cover all possible devices. Using Emulators: Tools like Litmus and Email on Acid provide emulators that let you see how your email appears on various devices and email clients. Cloud-Based Testing: Platforms like BrowserStack allow you to test on real devices hosted in the cloud, offering a more accurate representation than emulators.