Outgoing Spam Restrictions

• IPs not on our network will need to Authenticate using their mailbox credentials
• We'll block individual messages if they are bounces (mail delivery failure notifications) - we don't like to relay on bounce messages from customers own mail servers
• We'll block individual messages if they contain malware (virus)
• We'll block Authenticated users if they send multiple emails in a short time period to invalid email addresses
• We'll block IPs if they try to send multiple emails in a short time period that have a high high spam score
• We'll block the email if the sender address is invalid (eg no MX records etc)