I used the email-to-text email@example.com also, and it's a good (ie: free) alternative if you know the user is on Verizon. If it's a single customer that you need this for, using a service like EZtexting that lets you buy blocks of message credits is the way to go. The credits never expire to my knowledge (I've had a few unused credits for a couple years), so you'd only use the credits for this one customer. Buy a block of credits for something small like $10, and you'll have a happy customer and less headaches. For all of the people that you already know that the cell provider is Verizon, just keep using the email-to-text option, since it's free.