Protocols List -> SMTP email with attachment(s)

SMTP email with attachment(s) ports range, how to block SMTP email with attachment(s) in network?

  Protocol:
SMTP email with attachment(s)
Support: WFilter zh.4.0, WFilter en.4.0
  Author: imfirewall  
      Sending emails with attachement(s) via SMTP protocol. Please notice that "SMTP over SSL or STARTTLS" can not be supported.  

This protocol is official supported and installed by default.

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     User name:3.145.42.50
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