The best alternatives to mailbox.my are Throttle, EmailMatcher, and AnyAlias. If these 3 options don't work for you, we've listed a few more alternatives below.
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Tanka— Tanka = Slack + Glean, built for fast-growing startups.
Relevon is the easiest way to send personalized product emails based on what's happening in your store. 🛒 Increase your revenue while spending less time doing email marketing. Just set it and forget your ecommerce email campaigns w/ Relevon.io 🌴
E-Temp Mail is a free temporary email service that enables users to receive emails on an disposable email address. It allows users to create multiple email addresses at the same time and offers a variety of domains.