Hi,
The issue you are experiencing, where emails are not reaching Yahoo or Gmail accounts or are being marked as spam, is likely related to your OJS config.inc.php settings and your server’s mail configuration. However, the specific problem where “the email cannot be seen on the activity log” is a known issue that has been resolved in later versions of OJS.
Updating your OJS installation to version 3.4.0.8 will address this problem and improve the overall email functionality.
If you are unable to update your OJS version immediately, you can refer to the suggestions provided in this GitHub discussion:
https://github.com/pkp/pkp-lib/issues/9795
These steps might help you mitigate the issue until you can perform the update.