Send emails in sequences

I wish it could be possible to send emails in sequence, i mean, like a timeline and not separated. 

Ex: I send an email to a client, after some days i send a follow up. Instead of sending in the same email sequence, salesmate separate the emails. 

Using gmail is different, when we open the email, both are there, the first and the second. 

Hope you can understand what im trying to explain.

Sent from salesmate:

Sent from gmail: