You can easily send your own design email campaigns offer to your clients.
Here are the steps to perform :
1.Go to Sales Tools >> Emails Campaigns
2. Select your desire email template.
3. Design the template.
4. You can add content easily by dragging the content blocks from the right sidebar.
5. If you need to add a title then simply drag the module and give the title.
After designing the campaign
6.Click on Save then a pop will appear
7. Add Offer Title, select the Offer Validity.
8. Select client filter and proceed it. Filters like whether you want to send this campaign to your all client or active/inactive one.
9. Email campaign will be sent .
Also, here is the video tutorial for your reference