In contrast to server-based email monitoring software designed for big corporations, Email Spy does not need email server for its operation at all. Because Email Spy is being installed to each workstation, absolutely all SMTP-based emails sent by monitored users will be copied to your secret email address. In addition to that Email Spy blacklist option allows you to set flexible rules for outgoing emails of monitored computers (e.g. allows/forbids emails sending to specified addresses only). That feature is very appropriate for small and middle companies, which don't have own dedicated email server.

For that case all users from monitored computers can send emails to company and company partner email addresses only and can't send emails on behalf of company boss email address. Sending to all other emails addresses will be prohibited but monitored users will not know about that and they will not get any warning or error messages at that because Email Spy operation is invisible. At the same time absolutely all SMTP-based outgoing emails from monitored computers (including all prohibited) will be sent to your secret email address.

For that case monitored user can't send emails to competitors email addresses and can send all emails on behalf of own email address ONLY. Sending to all other email address will be allowed but sending on behalf of all other email addresses will be prohibited. At the same time absolutely all SMTP-based outgoing emails of monitored user (including all prohibited) will be sent to your secret email address.

Email Spy is installed to your own computer. In that case you can send SMTP-based emails to your contact email addresses (e.g. taken from your address book) and on behalf of own email address ONLY. All other emails will be prohibited, and what is more you could detect operation of any applications trying invisibly to send data/reports via email (like most of spy monitoring software or trojan programs do) because they will send all to your secret email ONLY but not to it original email addresses pre-configured by criminal during spyware install.