I find that if I started mutt at home, say, and then take my laptop to another WIFI hotspot mutt keeps using the nameserver that was set by DHCP on my home network. I try to send mail and it times out saying that it can't find the address for smtp.myprovider.com. A packet capture shows that it's still using the old nameserver. I have to exit mutt and restart to get it to read in the current list of nameservers.
Is there a setting to tell mutt not to cache the nameservers? -- Dan
