For every new mail, KMail will execute the command and use what it outputs (to standard output) as a signature.
KMail 每次新建信件时， 都会执行此命令并将其标准输出导入为签名。 用来配合此机制工作的命令通常是“ fortune” 或“ ksig-random ” 。
Additionally, IMAP can check for new mail over an existing IMAP connection, while POP3 has to open a new connection every time.
另外，IMAP可以在现有的IMAP连接上检查新邮件，而POP3每次必须打开新的连接。
Under the Receiving section, select the "Check for new mail every" option, and then set the interval to five minutes.
在Receiving部分，选中“Check for new mail every”选项，然后将间隔设置为5 minutes。
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