Question about Email library and bcc_batch_mode

[eluser]Aken[/eluser]
The BCC batch function itself is the same regardless of what resource is used to send the emails.

BCC emails are handled differently between SMTP and everything else. All except SMTP simply set a BCC header. SMTP itself loops through the list of BCC recipients and sends a "RCPT TO:" command, exactly the same as the "to" recipient.