33mail now supports multiple usernames in a single account. You can add additional usernames that forward to your existing account email address or specify a new forwarding address per username. Premium users get 1 additional username included, Pro users get 5, Enterprise users get 25. Your additional usernames will count towards your account alias limits but work the same way as standard usernames otherwise.
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You can add additional usernames on the dashboard settings page in the ‘Additional Usernames’ section. Please try out the feature and let us know what you think.