However, some spam filters and services require the person sending an email to log on to a website and answer some questions before the message is sent to the intended recipient. This takes time; about 5-10 minutes in my experience. If you send me an email from which you'd like a response, don't expect me to take this time in addition to the time it takes me to answer your letter! I get 5-10 such requests a day and always answer them myself.
So, if you have a spam filter and send me an email from which you'd like a response, PLEASE - take the needed steps yourself to put @ aircraftdesign.com on the "not-a-spammer" list!