BridgeDB web page does not mention that bridge-request mails cannot be sent from yahoo.cn
Currently, https://bridges.torproject.org/ says that bridge request e-mails must be sent ‘from a gmail or yahoo account’. According to the bridgedb.conf file in BridgeDB Git HEAD, BridgeDB will only accept e-mail bridge requests from gmail.com or yahoo.com; it rejects requests from yahoo.cn, for example, even though such addresses are attached to Yahoo Mail accounts.
The web page should be changed to specify exactly which e-mail addresses can be used to request bridge addresses. If possible, this part of the web page should be automatically generated based on the current configuration.