Well, as a matter of fact, I have 128M byte of swap space.
I have some new discovery. That is Netscape Ver. 2.0 can send mail with
FreeBSD-2.0.5 RELEASE. By the way, this mail is sent by the above box.
But Netscape Ver. 2.0 doesn't work with FreeBSD 2.1.0-RELEASE. I move the
same version of netscape to the 2.1.0 box. As soon as I hit the send mail
button, I got the same error message. Since I am using the same version of
X-Windows 3.1.2 in both RELEASEs, I am suspecting the "out-of-memory" problem
is causing by the operating system.