Why your email aliases need a strategy

Email aliases hide your real address from the recipient, but not from your email provider or anyone determined to cross-reference your details from leaked data. So if you use the same alias everywhere or route every email to the same inbox without other safeguards, your email only looks private. Determined attackers can and will find ways to exploit that single point of failure. Then there’s the other issue that no one warns you about. Most modern email services, including Gmail and Outlook, have built-in identity verification and will send shared alias domains straight into spam.

If you want to get around this, not only do you need to set up your own custom domain for email aliases, but also properly configure your domain with authentication protocols like SPF and DKIM. And finally, your email alias provider itself may be compromised, revealing your forwarding address through email headers, as in the case of Apple Mail. Alias providers may also have other points of failure, like the broken sync features in ProtonMail that many have complained about. So relying entirely on a single provider without a custom domain setup is a major red flag. Clearly, you need to plan out your email aliasing strategy from the beginning to avoid missing important emails, being relegated to the spam folder, or leaking your private inbox through faulty technical implementation from your email service provider.