Most likely either the hostname or IP changed. Delete the existing key for that server from your client, reconnect, and accept the new key it offers.

I've got SSH access to my server and seem to have mistakenly forwarded over 5000 emails to an account. I don't want to download them all and then delete them. Is there a quick way to delete them all ...

What is SSL/TLS? SSL and TLS are protocols used on the transport layer, which is used to provide a secure connection between two nodes in a computer network. The first widely used protocol that was ...