We recently changed from a POP3 connector to SMTP on our SBS 2008 server.
Our mail server was with BT and I thought we could use BT for our secondary MX record for when the Exchange Server was down. Anyway it seems not, so I's be grateful for help on a couple of issues.
1. Last Thursday the server was offline for 18 hours. I thought the incoming emails would attempt a few times (48/72 hrs?) before returning an NDR, but nothing has come through and no senders have received an NDR?
2. How can I find a reliable backup mail server if our own ISP/email service doesn't provide this. Would I need to change service altogether?
Thanks for any advice.