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C>S 0x5B SID_CHANGEEMAIL
Message Id:0x5B
Message Name:SID_CHANGEEMAIL
Direction:Client to Server
Used By:Diablo II, Diablo II Lord of Destruction
Starcraft Broodwar, Starcraft Original
Warcraft III The Frozen Throne, Warcraft III Reign of Chaos
Format:

(STRING) Account Name
(STRING) Old Email Address
(STRING) New Email Address

Remarks

Requests Battle.net to change the email address bound to an account. This packet must be sent before logon.

This packet used to be named SID_AUTH_DISCONNECT, however Blizzard never had it implemented, and so reused the packet ID for their email system.

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