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Two thoughts occur to me:
1. Having a virtual, personal assistant do a quick pass over your email twice a day, forwarding obvious business email to your business would be a big help. It would probably cost you less than $200/month. Search for "virtual personal assistant" on Google.
2. Since you have identified the sources of the problem you might be able to solve it with technology. For long time customers, set up email forwarding so that email from them is forwarded straight to your business. On your blog use a different email address, one that goes to your business email server.
5 months, 3 weeks ago on In the Trenches: Building a Business With Less of Me