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6. How Does It Work?

BitDefender Security for Exchange scans e-mail messages both at SMTP (Simple

Mail Transfer Protocol) level and at mailbox, or VSAPI (Virus Scanning Application

Program), level.

E-mail messages entering or leaving the Exchange server are scanned at SMTP level.

Inside the Exchange server, e-mail messages entering or leaving the users' mailboxes

are scanned at VSAPI level.

6.1. SMTP Scanning

When working at SMTP level, BitDefender checks mail using antispam, content and

attachment filtering, and antivirus scanning. This keeps clients’ Inboxes free of spam,

phishing attempts, viruses and spyware as well as other unwanted content. Moreover,

using content and attachment filtering on outgoing mail protects your company against

the theft of confidential information.

Let's consider that all the filters and engines are enabled and see how BitDefender

filters the mail traffic. A message is verified, in the following order, by:

1. Antispam Filtering (only incoming SMTP mail)

2. Content Filtering

3. Attachment Filtering

4. Antivirus Scanning

6.1.1. Antispam Filtering

The Antispam module will check the message first. Antispam filtering works at both

connection and content level to ensure efficient protection against spammers and less

traffic on the server.

Note

For detailed information about the Antispam filters, check the description of the Antispam

Module.

How Does It Work?

BitDefender Security for Exchange