A: When receiving tickets, a common cause of undelivered emails is email forwarding. This happens when you receive an email from john@acme.com at support@mycompany.com and then forward it to tickets@mycompany.uservoice.com. This is not supported behavior. This is the reason we allow you to specify addresses in your Email Addresses settings (read more about that here). Emails should go directly to the ones listed as your recipient address, otherwise they have a higher potential to be detected as spam.
Suppressions
When sending a response, if an email is undelivered after two attempts (bounces) or cannot be delivered as the recipient has previously violated one or more rules on the mail server, the address will be suppressed and no further attempts to send emails to that address will be carried out until the suppression has been removed. - This needs to be carried out by UserVoice Support. Please click the "Support" icon in the bottom-right corner to get in touch about your Suppression Removal request.