Animated Gif In Outlook Message. When the recipient opens email for the fourth time he or she will need to click the play button. In the desktop app Outlook animated GIFs are only played three times automatically.
Regardless of how you create your animated GIFeither with Adobe Animate or something elsekeeping your file size down is crucial for email. Learn more at the outlook help center. Find Actions in the Message ribbon tab and click it.
Here is an article for your reference.
If you are using an Office 365 Business account you can insert Animated GIFs into your email messages. When text or static images just wont do use an animated GIF to get your point across. In Outlook there are two ways to insert an animated GIF in Outlook. You can add animated GIFs to emails from the Outlook app but they wont show any movement if viewed in Outlook for WindowsMac or many other email programs.