A method for recording and certifying the reception of e-mail from a transmitting user to a recipient user in an email reception and certification system of a telecommunications operator, the certification system comprising at least one incoming mail server, at least one outgoing mail server (9, 19, 28), at least one database (16, 17), a time stamp server, a data processing unit, and a certification server which are interconnected, the method comprising: • a transmitting user, which is not a client of the telecommunications operator, sending the e-mail to a destination address, this address being the address of a recipient user, who is a client of the telecommunications operator; • reception, by the at least one incoming mail server, of the e-mail issued by the transmitting user; • passing the e-mail to the data processing unit which: ∘ disintegrates the e-mail into components; ∘ generates a unique numbering, and ∘ inserts the unique numbering in a database (16, 17) present in the telecommunications operator, in addition to in a remote database (16, 17) of the recipient user; • sending a copy of the e-mail without modifications to the recipient user, specifically to a second mail server of the recipient user through a second outgoing mail server (9, 19, 28); • notifying the certification server which creates a file with traceability data of the e-mail, sources, servers it has passed through, the non-printable attachments, the printable attachments, and signs the file with the digital signature of the telecommunications operator; • passing the file through a timestamp server to create a certificate; • delivering the certificate to a transmitting server of outgoing certified mails of the telecommunications operator; and • receiving the certificate from the server of outgoing certified mails of the telecommunications operator in a server of the transmitting user. • a transmitting user, which is not a client of the telecommunications operator, sending the e-mail to a destination address, this address being the address of a recipient user, who is a client of the telecommunications operator; • reception, by the at least one incoming mail server, of the e-mail issued by the transmitting user; • passing the e-mail to the data processing unit which: ∘ disintegrates the e-mail into components; ∘ generates a unique numbering, and ∘ inserts the unique numbering in a database (16, 17) present in the telecommunications operator, in addition to in a remote database (16, 17) of the recipient user; ∘ disintegrates the e-mail into components; ∘ generates a unique numbering, and ∘ inserts the unique numbering in a database (16, 17) present in the telecommunications operator, in addition to in a remote database (16, 17) of the recipient user; • sending a copy of the e-mail without modifications to the recipient user, specifically to a second mail server of the recipient user through a second outgoing mail server (9, 19, 28); • notifying the certification server which creates a file with traceability data of the e-mail, sources, servers it has passed through, the non-printable attachments, the printable attachments, and signs the file with the digital signature of the telecommunications operator; • passing the file through a timestamp server to create a certificate; • delivering the certificate to a transmitting server of outgoing certified mails of the telecommunications operator; and • receiving the certificate from the server of outgoing certified mails of the telecommunications operator in a server of the transmitting user.