OnCommandSAML is a TBasicHandler event handler property that represents the event handler signalled to initiate a mail transaction in which the mail data is delivered to one or more terminals or mailboxes. 

The SMTP SAML command allows delivery of mail data to a terminal, when the user is connected to the host and accepts terminal messages, or to a recipient's mailbox. 

OnCommandSAML will use the list of hosts or email addresses and the sender mailbox provided in the TIdCommand.Params found in ASender. When a list of hosts is present, they represent the reverse source route used to relay the mail message., and is used to return non-delivery notices for the message. The first host in the list is the most recent relay. 

The server implementation must assign a procedure to the OnCommandSAML event handler to allow responding to the event notification. When OnCommandSAML is unassigned, the text in Message.ErrorReply is sent to the client connection.

TBasicHandler Messages TIdCommandHandlers TIdCommand