Call a few commercial lines carriers.

You should definitely disclose it to your insurance agent, but it shouldn't increase your premiums if it's in good working order (and depending on your carrier).I would look at in terms of how much time and effort it is going to take to keep it in good working order.

The mail can be stopped by going to the post office that dispatches the mail carrier and telling them the situation.

I usually recommend $2 million in liability as a minimum, and I shoot for $1 million on the property policy and $1 million on an umbrella to start with.Some carriers don't offer the $1 million limit on the property policy.

I have worked in the Engineering Department for a short-line railroad for the past year, and was a mail carrier for the USPS for six years prior to that.

Analyzing and designing cellular towers for the large carriers, local, county, state and federal agencies.

I work with a large insurance carrier and Mark Manfre is one of my agents.

the first large-scale electrical air conditioning was invented and used in 1902 by American inventor Willis Carrier.

Can anyone recommend a good E&O carrier that doesn't have this exclusion?

You insurance carrier should be able to tell you about the requirements.