Найдите устройства в рамках здания
Смотрите на это руководство от парней в MailChimp. Я нашел это действительно полезным. Это - трудный процесс для разбираний, и иногда просто легче позволить третьему лицу иметь дело с отправкой. Смотрите на MailChimp, SendGrid, PostMark и CampaignMonitor (это позволяет переименовывать).
Также, если можно сделать, подписывание по крайней мере для новых клиентов стоит сделать (только, чтобы удостовериться, что они довольны сообщениями), Вы могли бы сохранять крошечный бит боли, но если Вы не дадите им, то опция многие из тех клиентов просто заблокирует Вас так или иначе. Откажитесь от подписки ссылки должны быть обязательными также.
Your CTO sounds like a world-class PHB, but that aside, if he's willing to spend the money, RFIDs would be the way to go. No problems with locating a laptop that's gone to sleep, because the RFIDs don't. And anyway, I'd point out that you're just not going to get a good, 100% reliable solution relying on WiFi with mobile devices - they do shut down things like their WiFi antenna to save power, and there's no really good way around that.
However, the problem you'll have is that if you put the RFIDs on the laptops (or do what Shane suggests) is that you're ultimately tracking the device, not the person, and people have been known to separate from their devices from time to time. It's more accurate to tag the employees than the employees' devices. This works best if everyone has a security badge they have to keep with them at all times, and you can attach the RFID to that, given that people will generally resist and resent having to carry a separate device around for ease of the CTO's employee-location efforts.
I personally think it's kind of creepy, and a dumbass way to waste to company resources on something completely trivial and irrelevant, but if the CTO really thinks it's worth devoting the time to, that's how I'd go about it. RFID tag the employee security badges, or failing that, the devices. And, I'd feel particularly brilliant if I could somehow set it to "accidentally" light up the CTO's phone at 4 in the morning, or during a board meeting, and so on.