>> 22:59:48.611916 max > max.badger1.net: icmp:
mail.badger1.net unreachable - need to frag (mtu 552) (DF)
>
>Okay, I think these need to frag messages are the problem I think the
>problem is that NAT gets a packet from the machine sending the mail,
>then changes the source address to be your NetBSD machine's address.
>It's about to send it out, but notices that it's bigger than your PPP
>link's MTU (552 bytes) and the Don't Fragment (DF) bit is set. So, it
>tries to send back a "need to fragment" message back, but it's already
>changed the address on the packet and ends up sending the message to
>itself instead of the machine actually sending the packet.
>
>I think a workaround for this would be to leave your PPP link's MTU at
>the default 1500

Thanks Dave.  I set MTU back to 1500, and the mail went through.  It also fixed
the problem loading an "excite" web page that I wa having trouble with.

I think I had changed it to 552 several months ago when I was troubleshooting
problems with my 56k modem connection.  The smaller number seemed to help.
The 1500 seems to be working fine now.

Thanks again,
Rog