Sendgrid is a recognised email service and is used by our company (a large global automobile manufacturer)
Following the instructions from here ..
https://docs.sendgrid.com/for-developers/sending-email/integrating-with-the-smtp-api
The password should be the api key but if I try to enter this I get an error saying password cannot exceed 16 characters.
The api key I have is 69 characters.
At the moment this means we cannot set up email alerts.
Increase the size of the password limit to allow long passwords.
Perhaps 255 characters ?