| 摘要 |
An electronic mail (email) system may include at least one mobile wireless communications device, and at least one email storage server for storing emails. The at least one email storage server may also be for associating with each email a unique identification (UID) value and a water mark value that sequentially changes for each email. The system may further include an email relay server for cooperating with the at least one email storage server for selecting emails from the at least one email storage server based upon the water mark values, and forwarding selected emails to the at least one wireless communications device based upon the UID values of the selected emails.
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