marketplace.constantcontact.comは安全ですか？

Constant Contact is reputable email blast service provider for small businesses. They are very insistent that your email lists be permission-based. We use their service, and have had nothing but positive results. Besides, they work with various providers so emails sent from their servers are less likely to be caught in spam filters, so as a small business, I know that more of my emails are actually reaching the inbox. Good, clean company and website.