Hi @Anjali Bisht 👋
This kind of font glitch in automation notifications is almost always down to how the message body is put together in the rule, which is good news, because it means you can fix it on your side without waiting on anyone.
The usual culprit is smart values. If your body pulls in fields like {{issue.description}}, Jira drops them in as wiki markup and the sizing comes out wrong. Adding .html to the value (so {{issue.description.html}}) converts it to clean HTML and the text renders at a normal size. There is a write-up of this exact behaviour here.
The other thing worth ruling out is pasted text. Anything copied from a doc, a page or another email into the rich text editor tends to bring along inline font-size styling that clashes with the message's own. Retyping that part, or switching the action to raw HTML and stripping those styles, sorts it. And if the whole message arrives unstyled rather than just oddly sized, check that your outgoing format is set to HTML and not plain text, in your Jira System settings under Default user preferences (steps here).
One thing that would help me point you straight at it: where exactly is the size breaking, in the email, in the Teams card from the Jira Cloud app, or both? Drop a screenshot of the send email step and the cause is usually obvious at a glance.
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