I’m not sure if Sendgrid has this option, but in Mailgun’s admin dashboard you can find the addresses that are blocked/suppressed and remove them. This typically happens when a user accidentally marks email from Discourse as spam.
Perhaps this:
I’m not sure if Sendgrid has this option, but in Mailgun’s admin dashboard you can find the addresses that are blocked/suppressed and remove them. This typically happens when a user accidentally marks email from Discourse as spam.
Perhaps this: