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Users receive an invalid or spam email error upon logging in
A user's email address may be marked as invalid due to the following reasons:
We receive an email notification from the email provider when one of these events occur. For all of the events except for the spam event, we then mark the user's email address as invalid and stop delivering future emails to them. When the user visits any page of the forum, they'll see a message that explains what happened when we tried to email them and requests that they update their email address. This ensures that users are aware that emails are not successfully being delivered to them so that they can update their email address and begin receiving emails properly. For the spam event, we will first try to unsubscribe the user from that particular type of email instead of stopping all email delivery to them. For the full mailbox event, the user will also be able to click a "re-enable email delivery" link on the page once they have freed up space in their email mailbox.
Email providers assign a reputation score to all IP addresses, email addresses, and domain names that send emails. Email delivery failures due to any of the reasons mentioned above cause that reputation to be negatively affected. If the reputation score goes too low, email from the associated IP address, email address, or domain name may be entirely rejected or may face delivery issues. We follow the process outlined above to ensure that your forum maintains a healthy email reputation so that email is always successfully delivered.