Question:
How do I integrate SendGrid with Wix Email Marketing to send emails through SendGrid instead of the in-built email sending mechanism?
Product:
Email Marketing
What are you trying to achieve:
I would like to send marketing emails through SendGrid in Wix
Hi, @GrapeCity_India !!
This method involves using code, but according to the Wix reference, there are three articles related to SendGrid listed below. 
As @onemoretime mentioned, it’ll be a custom built feature.
Also worth noting that this will be a complete build - you won’t be able to use the Wix Email composer
So, just to confirm — does that mean there’s currently no no-code way to integrate SendGrid with Wix? I’d like to update my understanding of the current state of SendGrid integration as well. 
You were correct 
- it requires code