Sending bulk SMS messages from a server: Options?

I have a server and seven "groups" of clients that I need to send SMS messages to. Each "group" contains ~100 cell phone numbers, and should be structured like this:

Message 1 -> Group 1

Message 2 -> Group 2

Etc

Assuming all group members are using verizon, could I just have my server transmit messages to the group members via verizon's sms gateway?

Message 1 could be sent to num开发者_运维技巧1@vtext.com + num2@vtext.com.....num100@vtext.com.

Message 2, same thing, but num101-num200.

Do you see any problems with this?

Could all messages to all groups be sent from a single email address?

Would something like Kannel help me at all?

Thank you for your time :)

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The only problem I can see is that Verizon is likely to have a spam limit (as a reference, AT&T's limit is 250 messages per domain per hour). If time isn't an issue, then you should be fine.