Custom indicator that emails

I'm creating a custom indicator that does 2 things. One, it changes the color of the chart when certain conditions are met. Two, it sends an email when those same conditions are met.

How can I make it so that it doesn't send emails when the indicator is loaded onto a chart? I don't want it to send 100 emails on startup.

I can think of two ways offhand:

1. If Bar index > 0, no email. This will prevent alerts from older bars.

2. In the Init function, set a datetime variable with the init timestamp. In your alert code check the current time against the timestamp. If less than a minute has expired, don't send an email.

I'd go with #2.