Currently, when the user sends the invite, appears a message: Invite sent, but sometimes Bitbucket tried to send the invite to the email address and for some reason couldn’t reach the user mailbox. If the email is on our suppression list and the user tried to sent the invite, the call to Bitbucket succeeds, but we treat the email as a hard bounce instead of attempting to send it.

Thus, this feature request is to add a notice type to indicate that there was a problem sending the invite.