Executive summary — Electronic registered delivery services, or ERDS, are the digital equivalent of registered post: they provide trusted evidence that a message was sent, delivered and received intact. This explainer defines ERDS, explains the proof it produces, and shows where this trust service matters. When it matters that a message was genuinely sent and received, email alone is not enough. It is hard to prove, after the fact, exactly what was sent, when, and whether it arrived unchanged. Electronic registered delivery services solve that problem. An ERDS is a trust service that transmits data between parties and produces reliable evidence about the transfer, including proof of sending and proof of receipt. It brings the assurance of registered mail into the digital world. What an ERDS provides The value of an ERDS lies in the evidence it generates around a transmission, not just the delivery itself. Proof of sending: evidence of who sent what, and when. Proof of receipt: evidence that the intended recipient received it. Integrity: assurance that the content was not altered in transit. Trusted timestamps: a reliable record of the timing of each event. How ERDS builds trust An ERDS sits between sender and recipient as a trusted intermediary. It records each step of the transfer and seals the evidence so it cannot be quietly changed later. Because the evidence is produced by a trust service rather than by either party, it carries greater weight if the transmission is ever disputed. Looking to add verifiable digital delivery? Talk to eMudhra. ERDS within the trust services family Electronic registered delivery is one of several trust services defined under frameworks such as the EU’s eIDAS regulation, alongside electronic signatures, electronic seals and timestamping. A qualified electronic registered delivery service meets the highest assurance level under eIDAS and benefits from a legal presumption regarding the integrity of the data and the accuracy of the sending and receipt times. Where ERDS is used ERDS is valuable wherever proof of communication is important: official notices, legal correspondence, regulatory submissions, contracts and high-value business exchanges. By replacing physical registered post with a digital equivalent, organisations gain speed and convenience without giving up the evidentiary strength that formal communications require. Frequently Asked Questions What is an electronic registered delivery service? An ERDS is a trust service that transmits data between parties and produces reliable evidence of the transfer, including proof of sending, proof of receipt and data integrity. How is ERDS different from normal email? Ordinary email offers little reliable proof of sending, receipt or integrity. An ERDS produces trusted, sealed evidence about each of these, backed by a trust service. What is a qualified ERDS? A qualified ERDS meets the highest assurance level under eIDAS and benefits from a legal presumption about data integrity and the accuracy of sending and receipt times. Where is ERDS used? It is used for official notices, legal correspondence, regulatory submissions and high-value exchanges, wherever proof of communication is important. Explore trusted digital delivery with eMudhra eMudhra provides digital trust services that help organisations communicate and transact with verifiable assurance. Reach out to learn how trust services fit your needs. Get started: https://emudhra.com/en/contact-us Tags: Trust Services About the Author eMudhra Limited eMudhra Editorial represents the collective voice of eMudhra, providing expert insights on the latest trends in digital security, cryptographic identities, and digital transformation. Our team of industry specialists curates and delivers thought-provoking content aimed at helping businesses navigate the evolving landscape of cybersecurity and trust services with confidence.