Abstract: Techniques are disclosed relating to improving secure message communication. In various embodiments, a message delivery server receives a request to deliver an encrypted message from a sender to a recipient. The encrypted message obfuscates the identity of the sender such that the message delivery server is unable to determine the identity of the sender. The message delivery server determines whether to deliver the encrypted message based on a signed attestation received with the request and, based on the determining, delivers the encrypted message to the recipient. In some embodiments, the determining includes verifying the signed attestation using a verification key provide by the sender. In some embodiments, the encrypted message is an email, a text message, a push notification, or a video or audio call request.

Abstract: E-mail synchronization may involve synchronization of data types, such as a unique identifier (UID), flag, header, and content. Upon identifying a trigger (e.g., user input) to receive a plurality of messages, a client device an implement an optimized retrieval scheme. This retrieval scheme may involve retrieval of multiple data types (e.g., UIDs, flag(s), and text) for one group of messages before those data types are retrieved for other groups of messages. Retrieval schemes can be determined and dynamically adjusted based on user input so as to provide quicker retrieval of certain data of certain messages. Retrieval schemes can also be optimized when multiple mailboxes are present.

Abstract: E-mail synchronization may involve synchronization of data types, such as a unique identifier (UID), flag, header, and content. Upon identifying a trigger (e.g., user input) to receive a plurality of messages, a client device an implement an optimized retrieval scheme. This retrieval scheme may involve retrieval of multiple data types (e.g., UIDs, flag(s), and text) for one group of messages before those data types are retrieved for other groups of messages. Retrieval schemes can be determined and dynamically adjusted based on user input so as to provide quicker retrieval of certain data of certain messages. Retrieval schemes can also be optimized when multiple mailboxes are present.

Abstract: E-mail synchronization may involve synchronization of data types, such as a unique identifier (UID), flag, header, and content. Upon identifying a trigger (e.g., user input) to receive a plurality of messages, a client device an implement an optimized retrieval scheme. This retrieval scheme may involve retrieval of multiple data types (e.g., UIDs, flag(s), and text) for one group of messages before those data types are retrieved for other groups of messages. Retrieval schemes can be determined and dynamically adjusted based on user input so as to provide quicker retrieval of certain data of certain messages. Retrieval schemes can also be optimized when multiple mailboxes are present.

Abstract: E-mail synchronization may involve synchronization of data types, such as a unique identifier (UID), flag, header, and content. Upon identifying a trigger (e.g., user input) to receive a plurality of messages, a client device an implement an optimized retrieval scheme. This retrieval scheme may involve retrieval of multiple data types (e.g., UIDs, flag(s), and text) for one group of messages before those data types are retrieved for other groups of messages. Retrieval schemes can be determined and dynamically adjusted based on user input so as to provide quicker retrieval of certain data of certain messages. Retrieval schemes can also be optimized when multiple mailboxes are present.