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SMTP command modification samples
For email message content modification these use cases are very similar to the services listed in section 2.2 of the “OPES Use Cases” RFC 3752 - "Services performed on (HTTP) responses".
Plus more SMTP/Email related:
Virus scanning (replacing infected attachments of a mail message)
Spam filtering (mark a message if it supposed to contain spam)
Verify mail signatures
Rewrite SMTP recipients
PPT Version