The Save Message dialogue box is opened. The type of file to save is already set to .txt. Your message will be saved as a plain text file. If you select more than one message, all the selected messages are saved one after the other in a single file. This is a more efficient way of storing messages but can be cumbersome to manage if there are many messages in one file.
Attachments are documents or other files sent along with messages.
They generally tend to be very much larger than normal messages. Attachments should be saved to disc then the message deleted as soon as possible. Think twice before subscribing to a list, if you do subscribe check your mail daily. Some lists can send out very large quantities of mail so if you do subscribe make sure you know how to leave the list. If you will not be able to check your mail for a period of time, unsubscribe from all lists - you can always join again later.