Are you still using Yahoo! or MSN Hotmail or any other free email services on the net like zwallet, comcast, etc with a combination of characters to define your user name like; andy_12345@yahoo.com or tickle-girl76@hotmail.com. If you intend to use it as a secondary email, that's okay. But don't use it for your business purpose or to interact with other professionals. Since spamming, spoofing or phishing is concerned, everybody is very wary of the kind of email the would received from such names. Most likely, they don't even read it especially if it message contains attachment. Do you think by using your own domain name email address like for an example sandy@sandy.com will help? Emmm, even an intergrity of an honourable PayPal service email is at stake because of enormouse phishing activities are still at larger. The best solution to at least gain back the respect that you deserve is to have your own support ticket webpage or website using php language for an example, http://www.yourdomain.com/support.php With such link to a support webpage, your customers will know that they will get nothing but just quiries that they have posted to you and you will know you have customers to attend to and most frequently you will have to read their quiries and answer them. From here, to avoid any thougth of you spamming your customers email, they will in return have to log in and see how their quiries are answered after automatic notification. Straight to business - straignt talk right! Okay, here is a tip to offer your customers a good return business is to have your sig.file label with other products, Second, to have a specific subject for other products, Thirdly, allow them to post articles of interest in your support website.. After all, if you still want to use your own domain name email address, there is no harm to it, but be sure it doesn't get spam..
This reminds me of an article I read that said you should have at least four email addresses: Junk Email Address, Business Email Address, Personal Email Address and a Wildcard Email Address. You can read the article at: http://ez2ba.com/html/help/guides/get-rid-of-spam.html