If you don't have enough quota because you've already sent some emails in the past 24 hours or because your campaign is too big, you'll have two options depending on your plan. Read this article to learn more.
Paid version
If you purchased a license for Yet Another Mail Merge, and don't have enough quota to send right away your whole campaign, you will get the following warning:
warning You don't have enough quota to send all emails now. But YAMM can automatically send remaining emails later.
done Recommended action: Activate YAMM to send emails remaining rows when your quota resets automatically.
Free version
In case you're on a free plan, you will get the following warning:
warning You don't have enough quota to send all emails now.
done Recommended action: You can only use your remaining quota now, and you will have to relaunch your YAMM 24 hours later when your quota resets to resend your mail merge to the rest of your list.