Delete?

I often send out a BCC from a distribution list of 150 people. I always get back half a dozen that didn't go through, whether because they are over-quota or the message was 'rejected' or 'unknown'.

Whenever I can, I call those people and often the reason is that they had not notified me that they had changed their email address. I then change their addresses in my book. But next time there's another half dozen or so...