You can change the e-mail server that is used to send e-mails from Administration.

By default, the e-mail server provided by cybozu.com is used to send e-mails notifying users of their login information and e-mails resetting their passwords.
The sender of the e-mails is"no-reply@cybozu.com".

When you want to use the e-mail server you prepared, configure the settings for the e-mail server and the sender on the "System Mail Account" screen.