While sending a bulk email to a group of contacts, you can add an additional layer of personalization to a few selected recipients. 

For example, while sending out a note appreciating the interest shown by 50 contacts towards your product,  you can mention the availability of a discount to only four of them by adding a "Click here for some exciting discounts" line. 

To personalize bulk emails, 

  1. In the Bulk email compose window, click Personalize.

  1. On the personalize email overlay that appears, select a specific contact from the list of recipients or add new recipients for whom you want to add a personalized message. You can add up to 10 recipients.

  2. Type in the personalized message for the contact/s.

  1. Click Next.

  2. In the next screen, you can set up the following:

    1. Give your bulk email a name - for example, “Product updates email”.

    2. Decide whether to send the email immediately or schedule it for a later time.

    3. Choose to track the email for opens and clicks.

    4. Add an unsubscribe link to make sure your uses have a way to opt-out of your emails.

  1. Click Send

Note: 
1) You can also choose to add new placeholders or remove attachments from a particular contact’s email.
2) When you close the personalized bulk email overlay, bulk emails would be saved as a draft, however, the personalized content will be present only for the next 24 hours.
3) You also have the option to add a different 'Reply to' address while sending out bulk emails.