A partner in our firm was having some problems sending e-mail to a client. After serveral troubleshooting steps we found there was no MX record for the client's domain in our cached lookups. I did an nslookup with the command set type=mx and recorded the MX record for the clients domain. E-mail started to flow through again. For some reason though, the record keeps disappearing and then e-mail won't go out again. Looking at the TTL for the record it is set to 1 hour. So my guess is that after one hour it will disappear again. Is there any way to make this record permanent or change the TTL on it? It's grayed out so I don't know if that's an option but it's very frustrating. I'm not a DNS expert by any means and would appreciate any information on how this works and any help.