Q:

Allow replying-to dynamic local-part of address sent by sendgrid

I have user in my system who can send emails through my API. The API uses SendGrid to send the emails with their username as the sender + reply-to address.
user_1@mydomain.com
user_2@mydomain.com
user_3@mydomain.com

What I would like to do is allow people to reply to these emails but I'm unsure how to do this.
Obviously if I try to reply as is - I get an error saying the email couldn't be delivered.
Is there something to do with SendGrid which can handle previously unseen addresses @mydomain.com or do I need to do something to set them up initially in the first place?

A:

The solution was to use incoming web-hooks.

