The E-mail2SMS license gives the ability to send out an E-mail and have it transformed to a text message, which is sent to a cellular recipient and also the other way around - send a text message to the Gateway and have it send out an E-mail.
The main feature, E-mail2SMS, will give you the ability to have users be able to send text messages from their PCs, without the need to use their cell phone and having them pay for work related text messages they send. Whether it's an expensive appliance or server, critical to your business operations or a lowly home NAS, holding a copy of your family photos, most systems have the option to send an E-mail upon an event (system down/up, intrusion detection, etc.). With E-mail2SMS, you can have that E-mail sent out immediately as a text message, either to your phone or a designated handset given to an on-call attendee.
The SMS2E-mail, on the other hand, will allow you to send E-mail messages from any phone with texting capabilities and save you the need to configure a corporate E-mail account on a cellular Smartphone, which is a possible security risk.
In some cases, there may not be 3G coverage and therefore - no Internet and no E-mail. You can still send out an E-mail from Your phone, using the SMS2E-mail. Smartphone's are relatively delicate and still a bit pricey, while the old 2G phones could withstand anything, last a lifetime and are dirt-cheap, which makes them perfect as the communication device for field workers who rough it out and need an adequately robust phone. The only downside to such a phone, not being able to send and receive E-mails, is now a thing of the past with the E-mail2SMS license.