Email threading with different subjects in HubSpot Sequences

HubSpot Ideas
1

Problem
When email threading is enabled in HubSpot Sequences, the next emails will be sent as replies within the same email thread including - each threaded email must have exactly the same subject line as the first email.
Suggestion
We want to be able to change subject lines for follow-up emails within the same thread.
For example, all as one thread:

Email 1 = “HubSpot is the best”
Email 2 = “RE: HubSpot is the best”
Email 3 = “HubSpot is the best - thoughts?”
Email 4 = “HubSpot product team are legends”
Email 5, 6, 7 etc. = I’m sure you get the idea :slightly_smiling_face:
If I am emailing someone from whatever email client (Google, Outlook etc.) it’s possible for me to change the subject line to whatever I want, there are no limitations when I hit ‘reply’. It would be great if the same is possible in Sequences.
Benefits
The anticipated benefits of such enhancement would be to enable greater personalisation, improve engagement and deliverability.
For additional context behind the problem I’m trying to solve, please find my post on the HubSpot community page: here

2

Email subject lines are so important and set the tone for the email as well as promting a lead to open and read the email. Customising each subject line in a sequence will make a HUGE difference in the communications. I feel like this is a very important option to have in the sequences.
Thanks!