My server is having trouble exchanging mail with another SMTP server. After much troubleshooting I ran accross an article that states that this might be caused by a "black-hole" router and MTU/packet issues. Sounds weird but I want to give it a try. My questions are:
1) Should I use "ip mtu xxx" or "ip tcp adjust-mss"? What are the diferences between these two commads.
2) Should I apply this to the WAN or LAN of my Internet router?