windows 版本的邮箱大师设置里可以指定存储路劲，MacOS 版本没有相关的配置，数据实际存储在如下路径：

/Users/david/Library/Containers/com.netease.macmailhttp://www.cndba.cn/dave/article/131633

http://www.cndba.cn/dave/article/131633

注意这里邮箱账号的保存路径是：

/Users/david/Library/Containers/com.netease.macmail/Data/Library/Application Support/data

david@Lotus-2 com.netease.macmail % pwd
/Users/david/Library/Containers/com.netease.macmail
david@Lotus-2 com.netease.macmail % ls
Data
david@Lotus-2 com.netease.macmail % cd Data 
david@Lotus-2 Data % ls
Desktop        Downloads    Movies        Pictures    tmp
Documents    Library        Music        SystemData
david@Lotus-2 Data % cd Library 
david@Lotus-2 Library % ls
Application Scripts    Dictionaries        Keychains
Application Support    Favorites        Logs
Audio            Filters            Mail
Caches            FontCollections        PDF Services
Calendars        Fonts            Preferences
ColorPickers        HTTPStorages        QuickLook
ColorSync        Images            Saved Application State
Colors            Input Methods        Sounds
Components        KeyBindings        Spelling
Compositions        Keyboard Layouts    WebKit
david@Lotus-2 Library % cd Application/ Support 
david@Lotus-2 Application Support % ls
AddressBook        com.netease.macmail    logs
CrashReporter        data            profile.ini
SyncServices        iCloud
david@Lotus-2 Application Support % cd data
david@Lotus-2 data % pwd
/Users/david/Library/Containers/com.netease.macmail/Data/Library/Application Support/data
david@Lotus-2 data % ls
app.db                database@ustc.edu_8030
calendar.db            hotfix
calendar.db-shm            images
calendar.db-wal    
david@Lotus-2 data %

迁移邮件时把这个路劲复制新软件的对应目录即可。http://www.cndba.cn/dave/article/131633

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