We have around 20,000 contacts in our database. 99.9% of the time, we mail merge an individual contact (an activity reservation confirmation). On odd occasions, we do a lookup for a number of contacts and email those in the lookup. There have been a few occasions when we have closed the lookup and reverted to emailing an individual contact (with the whole database as a default lookup), only the mail merge has not been manually changed from 'lookup' to 'contact'. Whilst this is a clear mistake on our part, the fact that it has happened three times (albeit in 15 years!) begs the question, would it be possible to include an optional safeguard i.e. "Are you sure that you want to communicate with multiple contacts etc". Even if the inclusion of this question is configurable in the Preferences as I am sure many people only message lookups. Fortunately, on each occasion, I've seen the mail merge window escalating through the contact numbers and managed to Cancel before too much damage is done.