It can, but that's kind of the nature of anti-spam systems these days. Come in on a Tor IP with a randomly-generated burner e-mail with a Curl user-agent and you're gonna get blocked from almost anything that spammers have an interest in. Come in on the e-mail address, aged cookies, and a geolocation associated with your credit card for years and you're gonna be fine. Do things in the middle and expect some amount of false positives.