H3C Technologies H3C SecPath F1000-E - Manual (Page 65)

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• ActiveX blocking—Blocks ActiveX plugin requests to untrusted websites, protecting networks from
being attacked by malicious ActiveX plugins.
• Java applet blocking—Blocks Java applet requests to untrusted websites, protecting networks from
being attacked by malicious Java applets.
SMTP packet content filtering
The SMTP packet content filtering, hereafter referred to as SMTP filtering, includes these functions:
• Sender filtering—Filters sender addresses in SMTP requests, preventing specified senders from
sending emails.
• Receiver filtering—Filters receiver addresses (including recipients and CC recipients) in SMTP
requests, preventing internal users from sending emails to the specified receivers.
• Subject filtering—Filters mail subjects in SMTP requests, preventing users from sending emails that
contain specified keywords in the mail subject.
• Body filtering—Filters mail bodies in SMTP requests, preventing users from sending emails that
contain specified keywords in the mail body.
• Attachment filtering—Checks the names and contents of the attachments in SMTP requests,
preventing users from sending emails that carry attachments with specified names or with specified
keywords in the attachment content.
• Illegal command blocking—Blocks SMTP requests that carry illegal command words.
NOTE:
Legal command words in terms of content filtering include HELO, EHLO, RSET, QUIT, DATA, NOOP,
HELP, EXPN, TURN, VRFY, SOML, SAML, SEND, MAIL, RCPT, and AUTH.
• Oversize mail blocking—Limits the size of the mails from internal users and blocks emails that are
oversize.
POP3 packet content filtering
The POP3 packet content filtering, hereafter referred to as POP3 filtering, includes these functions:
• Sender filtering—Filters sender addresses in POP3 responses, preventing users from receiving
emails from the specified senders.
• Receiver filtering—Filters receiver addresses (including recipients and CC recipients) in POP3
responses, blocking emails that contain the specified receiver addresses.
• Subject filtering—Filters mail subjects in POP3 responses, preventing users from receiving emails
that contain specified keywords in the mail subject.
• Body filtering—Filters mail bodies in POP3 responses, preventing users from receiving emails that
contain specified keywords in the mail body.
• Attachment filtering—Checks the names and contents of the attachments in POP3 responses,
preventing users from receiving emails that carry attachments with specified names or with specified
keywords in the attachment content.
FTP packet content filtering
The FTP packet content filtering, hereafter referred to as FTP filtering, includes these functions: