A system for secure electronic correspondence between at least one sender user and at least one addressee user, said system comprising at least one electronic correspondence domiciliation server (1300, 1301, 1302), at least one composition server (1710, 1711, 1712) of said correspondence and at least one server for the certification of electronic correspondence (1500, 1501,1502), said system being such that, for each correspondence transaction with probative value: - said composition server is adapted to generate at least two specimens, as well as two unique originals certified with probative value and to send one of the specimens to said domiciliation server (1300, 1301, 1302); - said domiciliation server (1300, 1301, 1302) is adapted to: ∘ authenticate said sender user by a strong authentication mean; ∘ make said specimen available to said sender user; ∘ receive from said sender user a validation of the correspondence; ∘ create a legal signature structured file linking the strong authentication, said specimen, and the validation of the correspondence, and seal this structured file with a SHA1 condensate; ∘ then transmit to said certification server (1500, 1501,1502) a certified copy of said structured file; - said certification server is adapted to: ∘ carry out a conformity check on the summary list of the structure file, as well as a consistency check against the database; ∘ electronically sign the structured file, then transmit an audit trail resulting from the compliance check to an escrow server of a court bailiff, said audit trail comprising the checks and the signed copy of the structured file; ∘ issue, based on a escrow certificate from the bailiff, a probative value certificate for the legal signature of the originals and the electronic signature of the structured file; - after validation by the sender user and recording of a report establishing the probative value of the original, said composition server (1710, 1711, 1712) is adapted to process the other specimen to be sent to the addressee user of the correspondence operation. - said composition server is adapted to generate at least two specimens, as well as two unique originals certified with probative value and to send one of the specimens to said domiciliation server (1300, 1301, 1302); - said domiciliation server (1300, 1301, 1302) is adapted to: ∘ authenticate said sender user by a strong authentication mean; ∘ make said specimen available to said sender user; ∘ receive from said sender user a validation of the correspondence; ∘ create a legal signature structured file linking the strong authentication, said specimen, and the validation of the correspondence, and seal this structured file with a SHA1 condensate; ∘ then transmit to said certification server (1500, 1501,1502) a certified copy of said structured file; ∘ authenticate said sender user by a strong authentication mean; ∘ make said specimen available to said sender user; ∘ receive from said sender user a validation of the correspondence; ∘ create a legal signature structured file linking the strong authentication, said specimen, and the validation of the correspondence, and seal this structured file with a SHA1 condensate; ∘ then transmit to said certification server (1500, 1501,1502) a certified copy of said structured file; - said certification server is adapted to: ∘ carry out a conformity check on the summary list of the structure file, as well as a consistency check against the database; ∘ electronically sign the structured file, then transmit an audit trail resulting from the compliance check to an escrow server of a court bailiff, said audit trail comprising the checks and the signed copy of the structured file; ∘ issue, based on a escrow certificate from the bailiff, a probative value certificate for the legal signature of the originals and the electronic signature of the structured file; ∘ carry out a conformity check on the summary list of the structure file, as well as a consistency check against the database; ∘ electronically sign the structured file, then transmit an audit trail resulting from the compliance check to an escrow server of a court bailiff, said audit trail comprising the checks and the signed copy of the structured file; ∘ issue, based on a escrow certificate from the bailiff, a probative value certificate for the legal signature of the originals and the electronic signature of the structured file; - after validation by the sender user and recording of a report establishing the probative value of the original, said composition server (1710, 1711, 1712) is adapted to process the other specimen to be sent to the addressee user of the correspondence operation.