> For the complete documentation index, see [llms.txt](https://brixxbox.gitbook.io/brixxbox-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://brixxbox.gitbook.io/brixxbox-documentation/client-api-reference/events/onmailhistoryshow.md).

# onMailHistoryShow

This event is called just before the mail history panel open.

## Example Usages

```javascript
   console.log("mail history panel opened");
```