I had a look to the Sendgrid account and I saw several undelivered emails because the shared IP used by Sendgrid to send emails is marked as Spam.
With the current tier, we don't have access to a dedicated IP which means that we are dependents on spammers activities using Sendgrid free tiers.
We currently have three possibilities
- Pay 89$ per month instead of 25$ to have a dedicated IP, and more people would be allows to manage the Sendgrid account
- Investigate with LinuxFoundation if we can use their email system this will have downside consequence that we first to understand
- Leave the situtation as is, and hope that Sendgrid can be better control that situation
- Investigate sponsoring opportunities with Sendgrid