confirming same token length
List-Unsubscribe: <https://meta.discourse.org/email/unsubscribe/abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkl>
List-Unsubscribe: <https://discuss.mydomain.org/email/unsubscribe/7d1687b646074f0efc9abef16daeb42200f1beca5767de095960f4ac6b9b4ea2>
confirming missing unsubscribe image, only link is present
also, gmail consistently accepts discourse/sendgrid sign up emails but either places them in spam or labels as suspect, holds images and places the email in inbox