Profile & account -> Account setting -> Notifications -> Email Preferences -> EXPAND ->

1. Send me email notifications -> Change to Never.

2. Send me emails with Slack news and tips Saved -> Don’t agree.

取消收SLACK邮件方法：点头像 -> Profile & account -> Account setting -> Notifications -> Email Preferences -> 点一下EXPAND ->1. Send me email notifications设置成Never ->2. Send me emails with Slack news and tips Saved 不打勾。