For example, something that is too complex for your comfort level, a security concern, or maybe your hardware can’t keep up with the service’s needs?
For example, something that is too complex for your comfort level, a security concern, or maybe your hardware can’t keep up with the service’s needs?
The sending server will retry a few times, so you have at least a few days to bring it back. And if you prefer an additional fail-safe - adding a secondary MX somewhere else which will just store mails until the primary comes back is trivial.