According to :
Zimbra MTA - Zimbra :: Wiki
"you can manually forward messages as message/rfc822 attachments to the spam and non-spam mailboxes."
who is allowed to forward spam/ham to the two training accounts? can an external user do that? for example can i use my gmail account to send, as attachment, spam/ham to my company two training accounts?
Or, is there away to limit who can send spam/ham to those two accounts?