Hey @ademiguel, thanks for replying.
Yes, as per the attached screenshot, it seems the mail went through, but it is not arriving in the target email box - any mail boxes including spam.
I just re-tried at 6:57pm in my local time and the below is the activity report in the Sendgrid.
It is not showing any result of just what I tested at 6:57pm.
The whole thing gives me a clue that the whole connection is done, but something is not working properly.
What do you think? Is there any specific info you need to check?
Oh, I created a dynamic template in Sendgrid and used it using Sendgrid plugin.