The primary problem in getting Mentor Graphics to work remotely seems to be having the right fonts installed. To get the right fonts, you must run the mgc_font_collect script on a machine that has Mentor Graphics installed, and then copy these fonts to your computer and add them to your X font database.
Surprisingly this is pretty straight-forward. In Redhat, there is almost no dreaded sendmail hackery to be done. First off, if you don't have a static IP, you're going to be SOL, and you're going to have to settle for using fetchmail or POP and changing your FROM address in your mail client. In which case, refer to those questions in this FAQ.
If you do have a static IP address, and have a registered domain name (note, this is probably only possible if you live in private housing. In which case you can usually request a static IP), then all you have to do is edit /etc/sendmail.cw and on a line by itself, put in the domainname that points to your static IP address, then restart sendmail (something along the lines of /etc/rc.d/init.d/sendmail restart for System V style inits).
Cool mail clients first: in Mutt, simply add
my_hdr From: someuser@somewhere.net (Some Name)
to .muttrc. In Pine, you can set the hostname of the from field but apparently not much else. Go to (S)etup, then (C)onfig, then edit the second field down. In Netscape you may specify the whole email address under Edit->Prefrences->Identity.