Fastmail Masked Email vs Runbox

Fastmail Masked Email creates a random email alias for each login, letting users give a site an address other than their real one. Using separate aliases can make it harder for companies to connect accounts for tracking. Messages to these addresses arrive in Fastmail; a masked icon marks them, and opening a message shows the label assigned to the address. An alias can be turned off if it starts receiving spam, which Fastmail says may help identify who exposed it. Users can connect Masked Email with 1Password or Bitwarden, or use their own domain; Fastmail says a custom domain is less anonymous than its shared domain but makes addresses portable. A JMAP extension lets apps read and manage addresses, though pending API-created aliases are deleted after 24 hours and do not appear in the interface. Fastmail supports two-step verification and passkeys and encrypts stored data and communications. Its own apps do not offer end-to-end encryption. Plans start at $4 a month, and a 30-day trial is available; there is no free plan. Access is available on Android, iOS, Linux, macOS, Windows, and the web.

Runbox is a paid email service from Runbox, founded in 2000 and headquartered in Oslo, Norway. It works on the web, iOS, and Android, and supports IMAP and SMTP. Listed features include end-to-end encryption, custom domains, and email aliases. The Micro plan provides 2 GB of email storage, 200 MB of file storage, one email domain, and 100 @runbox aliases; aliases on a user’s own domain are unlimited. Micro is €1.66 per month, displayed monthly and billed annually. Mini costs €2.91 per month with 10 GB email storage, 1 GB file storage, and five domains. Medium costs €4.16 per month with 25 GB email storage, 2 GB file storage, and 10 domains. Max costs €6.66 per month with 50 GB email storage, 5 GB file storage, and 25 domains. Runbox has no free plan and lists a 30-day trial.