[MlMt] taking SMTP servers offline?

[Steven M. Bellovin]

Is there any way to take SMTP servers offline?  Often, when I'm on a 
plane, I have WiFi on (for example, to use the flight-tracking web 
page), but I don't feel like paying for Internet access.  If I compose 
messages (and it's a great time to catch up on back email), I'm 
constantly getting pop-ups about edit, retry, try later (I got three 
while composing this very message...).


         --Steve Bellovin, https://www.cs.columbia.edu/~smb