How you can create an email thread with Sequence in HubSpot

Email threading allows you to create sequences so that the contacts receive sequence emails in a single conversation rather than creating separate, individual conversations for each email.

Enable by default for all contacts

• Go to Automation > Sequences in your HubSpot account.
• Click the name of the sequence that you want to edit.
• Click Edit on the sequence summary page.
• Click the Settings tab on sequence editor.
• Switch on the toggle Thread emails as replies to the first email.
• Click 

Enable for an individual contact

• Go to Contacts > Contacts in your HubSpot account.
• Click the contact you want to enroll in your sequence.
• Click the Email tab and then click Create Email. 
• Click Sequence  in the new box.
• In the new box that open, select the sequence.
• In the new box, sequence that you selected will appear. Click the dropdown Settings. There switched on the toggle Thread  emails as replies to the first email.
• Click Save.
• Review the sequence and make any further customization as per requirement, then click Start sequence at the bottom.

Emails in this sequence will now appear as part of a continuous conversation in this contact's inbox instead of separate email threads. You can expect it to look like threading does in a normal email thread.