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Life & fun · March 4, 2022

Mailwitness – Digital Signatures over Email

Hi HN, I'm Marek Dopiera and I wanted to share the digital signature solution which I made with my software house. Your feedback would be much appreciated. We've just launched it - it's a service for signing documents over e-mail - https://mailwitness.com. It still has some rough edges, but hopefully it is useful already. To sign a PDF with somebody, you e-mail them the PDF and put [email protected] in CC. If they agree, they need to forward it to [email protected]. When they do, you all get your document signed. You can generate PDFs from e-mail, too for convenience. We made…

Mailwitness – Digital Signatures over Email launched on March 4, 2022 with 17 votes, #1,060 of 3,153 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 4 years on.

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In plain words

Mailwitness is a digital signature service that works directly through email. Users send documents to signatories and CC [email protected]; when recipients forward the email to that address, all parties receive a signed copy. The service also generates PDFs from email for convenience. It targets people who currently rely on email chains or printed signatures for agreement documentation, offering a more secure alternative to informal email-based contracts without requiring separate signing platforms.

written from the facts on this page · September 2026

From the sources

Mailwitness - radically simple digital signatures.

We make digitally signing documents extremely easy and convenient. Our mission is to increase the safety of contracts made through email. Making deals over email is dangerous. If you do, all protection you have is an email in your inbox and an email in your "Sent" folder. Unfortunately, none of them are irrefutable - the other side may claim they never got an email from you, may forge a fake email from you or may even claim that you forged the email from them. Email technology makes it often impossible to prove the other party wrong. In order to address these problems you should use digital signatures. We make it extremely easy. To sign any number of PDFs, simply attach them to an email and…from mailwitness.com

In the maker’s words, at launch

Hi HN, I'm Marek Dopiera and I wanted to share the digital signature solution which I made with my software house. Your feedback would be much appreciated. We've just launched it - it's a service for signing documents over e-mail - https://mailwitness.com. It still has some rough edges, but hopefully it is…

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