OK... but my point was the exact opposite.
I find they warm up to the idea quite nicely when it's the only way their email is going to get delivered :).
The company owns the relays and irrespective of what the techs think, mgmt makes the decisions.
Without prior mgmt agreement, this is probably grounds for termination, and I'm rather fond of being paid :)
I've had a few people wanting to use 3rd party email for business work in the past, but with the current HIPAA and SOX regs, the auditors will back me up on telling them they need to quit that. I realize not everyone operates in that environment, or under those circumstances.