Yes, we integrate with Gmail and communicate via the official Gmail API.
We only receive response statuses and act accordingly. Moreover, we think it's important for this functionality to make sense to insert the hash corresponding to the integrity of the email, and so make possible for our customers to "prove" they have indeed sent an email with a specific body/subject/...
We only receive response statuses and act accordingly. Moreover, we think it's important for this functionality to make sense to insert the hash corresponding to the integrity of the email, and so make possible for our customers to "prove" they have indeed sent an email with a specific body/subject/...