How Do Mail Servers Work?Why Run Your Own Mail Server?CaveatsWhen Not to Run Your Own Mail ServerWhich Mail Server to ChooseInstalling the Mail ServerConfiguring the FirewallMaking Sure Postfix Starts During BootConfiguring PostfixConfiguring Your System to Send MailConfiguring Your System to Receive MailSetting Up Users to Receive MailsTaking a Few Antispam MeasuresReceiving Mails for Several DomainsAuthenticating UsersEncrypted ConnectionsUsernames, Passwords, and SuchRetrieving MailsConfiguring Your FirewallConfiguring DovecotUsing WebmailSummary