We've noticed some misconceptions about email aliases and some recommendations that are bad for privacy in the comments. We'd like to share our thoughts on the matter in case anyone is interested in learning more about it.

1. How do email aliases protect you online?

Why not simply use an extra email account with plus-addressing (as one commenter recommended)?

• If your goal is to protect your privacy online, you must reduce your digital footprint. You simply cannot achieve that by providing the same email address (even if it's a secondary email) to different services online. The plus sign does not prevent you from being identified. Data brokers can easily link all your accounts in that case.
  • With privacy-kit, every service would have a completely unique and unlikable email alias making it impossible for data brokers to link your accounts by email addresses.
• If your goal is to protect yourself from spam, using plus-addressing does not prevent your email address from being sold to third parties and spammers. Spam won't necessarily go to you main email in that case, but you'd still be receiving it in your secondary email. Your inbox would quickly become cluttered and unsafe.
  • When using privacy-kit, every email alias is tied to the website it was generated for and only accepts emails from domains registered and verified by the website owner. This means privacy-kit email aliases cannot be shared with third parties and cannot receive unsolicited mail.
• If your goal is to protect your privacy against email service providers and aliasing services, using a secondary email address with plus-addressing does not have any impact. Your email provider, responsible for storing all your emails, can simply access them at any point in time. If you're using an encrypted email provider, they would have read access to your emails before encrypting and storing them.
  • When using Privacy-Kit, our Mail Relay service is designed to process emails in-memory and never storing them to disk. This means upon reception of an email, Mail Relay can encrypt your email with zero access encryption and relay it in its encrypted form to your email provider. Your email provider, responsible of storing your emails, cannot access the contents of your emails in that case. This allows you to do a separation of concerns between providers responsible for storage and providers responsible for encryption with zero storage.

2. Are we evil? 😈 providing a free service to steal and sell your data?

• First of all we are not a free service. Our business model is very fair and transparent and allows us to fully fund the operation of our services and the development of new products for our users. That said, we do have a free plan aiming to help small creators and businesses provide privacy functionality under a certain usage threshold.
• We have spent more than two years designing and building our existing products from the ground up to provide best-in-class privacy for our users. We opened Mail Relay to the public almost a year ago.
• We're also contributors to select Open-Source projects aiming to improve Free-Speech online. For instance, we are contributors to Lemmy: e.g. https://github.com/LemmyNet/lemmy/pull/4881

3. Lots of unfounded accusations in the comments. Here are some answers:

• No. We're not hiding our Github repo. It's actually the first link in our post. It's also available in the linked blog post and available on our website.
• No. We're not hiding the fact that users need to sign up to use Hide-My-Email. It is technically impossible to provide the service otherwise. This requirement is mentioned in the first paragraph on privacy-kit's Github README.
• No. Privacy-Kit's repo is not sketch because it only has 2 contributors. The repo is open source and verifiable by anyone. It uses a very permissible MIT License and it was just open-sourced yesterday. Contributions are more than welcome ❤️.
• No. The privacy-kit repo is not just a website and it does not import unknown code as suggested in the deleted comment 😳. It actually contains the privacy-kit library code, which is a lightweight library with zero dependencies. It also includes two HTML pages for testing under a /test directory. These are not part of the library bundle.

We just felt the need to clear these misconceptions.

Thank you all for supporting us in our mission to improve privacy online ❤️

Regarding those screenshots:

But then visitors immediately have to create an account with pportal .io to actually get at the newsletter/sign-up/etc.?

I had a quick look at your main page but it did not answer that question.

I understand that a web dev who wants to offer this has to open an account or get an api key of they want to use your service.

Also I could not find a link to the git repo.

edit: according to OP's answer it is as I thought. Yet another company that collects data both on sites and their visitors. Another iteration of the good old Free model a lá Google.

edit2: my personal recommendation is still that people get themselves at least one extra email account with plus-addressing. From a trusted provider of course.