When the services are down, what happens to sent mail?

[markrich]

When the Scalix services are shutdown for routine backup, what happens to the mail sent to the server?

We have internal and external services which send mail to the system. I had expected SENDMAIL to receive this and hold until the services were up and could be delivered but I see no evidence that is is the case.

Can anyone help?

[Valerion]

By default the Scalix SMTP Relay listens for incoming email, and sendmail sends outgoing email only. When you shut down Scalix the relay goes down as well, and no incoming mail is accepted. It is possible to get sendmail to be the primary listener, but it's not well documented that way (or for that matter recommended, as you break SMTP Auth on port 25). If the remote sites are properly RFC-compliant they will queue for the the length of the downtime and resend (usually up to 5 days), or deliver to the secondary MX's, if defined, so you shouldn't lose any email.