Key Features

• Header-Based CC & BCC:
  CC and BCC recipients are sent via real SMTP headers, never injected into the email body. BCC recipients are hidden from all other recipients.
• Dual CC/BCC Input:
  Choose CC/BCC recipients via partner selector or type raw comma-separated email addresses — both fields stay in sync automatically.
• Enforced To Header:
  Ensures a proper email_to header is always set on outgoing mail records, even in mass-mail mode.
• Duplicate Prevention:
  Automatically strips CC/BCC addresses that already appear in the To field, preventing double delivery.
• Chatter Metadata:
  Stores effective To, CC, and BCC on each mail.message for complete auditability of all communications.
• Chatter Display:
  An OWL template patch renders To, CC, and BCC lines below each message in the web client chatter.
• Template Support:
  Pre-populates CC and BCC from mail.template when composing from a template, using safe rendering APIs.
• Follower Suppression:
  Suppresses follower-based notification expansion — only explicitly addressed recipients receive the email.
• Mass Mail Compatible:
  Works correctly in both single-recipient comment mode and mass-mail modes, logging CC metadata in both paths.
• Admin Audit View:
  Technical mail.message form view shows bs_email_to, bs_email_cc, and bs_email_bcc fields for inspection.