Email Delivery Flowchart SPAM Filter
Does the mailbox exist?
Send rejections notification (no such user, mailbox does not exist, etc.)
NO
YES
Scan for viruses Disgard the email
Does it contain a virus?
Check SPAM filter Whitelist
Deliver to Exchange server
YES
NO
Does it contain malware? s Is it on the Whitelist?
NO
YES
Mailbox Check SPAM filter Blacklist
YES
NO
Mailbox
Mailbox Is it on the Blacklist?
Mailbox
Mailbox
Scan and Score the email
YES
NO
Is message marked as SPAM? Scan Score = 0 - 3.4 Scan Score = 3.5- 4.9
YES
NO
Scan Score = 5.0 or >
Is Automatic junk email filter on?
Tag as SPAM by inserting a ~ symbol at the beginning of the Subject line
YES
NO
Deliver to Inbox
Deliver to Junk E-mail folder