Send plain text messages. 

Include a descriptive "Subject:" line. 

Compress files as ZIP before attaching the file to a message. 

Scan all incoming messages for viruses, scripts, worms and trojans. 

Update virus scanner definition files daily. 

Never send large file attachments.

Never send executable files as attachments. 

Never use the Outlook Preview Pane in the Inbox folder. 

Never respond to a spam message.