1.Reply with Quote: This option is useful when you want to reference the original message in some way – such as answering a specific question about something in the message, making a recommendation for a change in the message, etc. If you use Reply with Quote the entire original message will be seen along with your changes. If you only want to reference a portion of the original message you can highlight that part and when you Reply with Quote the recipient will only see the portion that was highlighted along with any additions that you made. 

2.Reply All: All those named on the original message are included in the reply field.

3.Reply Sender: This will reply only the sender of the original message.

4.Reply Conference: The message will be sent to the conference where the original message was sent from.

5.Reply Original Author: The message will be sent only to the originator of the message even if the message was forwarded on by another participant. 

Please note that you also have the option to add or delete any addressee before you send the message. 

Please further note that you have several options when sending your mail. As shown above you can send your message with different levels of Priority and Sensitivity as well as requesting to be given different types of Receipts. These can all be accessed by going to Message and selecting your preference at the bottom of the drop down listing. 
 

Creating Messages

FirstClass Message Extras