如何实现将已发送的邮件保存到服务器上
看到有网友在问这个将客户端发出的邮件保存到服务器上，所以找了一圈，看到下面这篇文章，以下内容转载自https://madlax.pw/2020/05/379.html
Chevereto使用暗抄（BCC）方式保存smtp发送的邮件
最近把邮件服务器从winwebmail换成了Mail-in-a-Box（MIAB），主要是因为winwebmail的window服务器占用资源比较多，而且IIS配置也不方便不熟悉，再一个一直不支持DKIM签名。MIAB确实很方便，有一键包直接完成，要设置的SPF和DKIM也照着他显示的去DNS里设置就好。
但是在Chevereto里调用SMTP发件时发现并没有在发件箱里保存发送的邮件。
查找资料后发现SMTP发送的邮件并没有保存副本到发件箱。
SMTP has no access to your incoming mail; it is simply for outgoing mail. There is no easy way for SMTP to save copies like this.
Yes, Thunderbird can automatically save a copy of all mail it sends, but it uses IMAP to do that.
One thing you could do is to BCC yourself to have a copy of direct-SMTP emails also be sent to you. That would place them in your inbox, but perhaps a filter can move it to Sent for you automatically.
There are also other ways: https://www.chilkatsoft.com/p/p_461.asp
But, as you can see if you look at their code examples, they all send the email via SMTP and then save a copy via IMAP.
于是考虑在发件时添加一份暗抄，然后用过滤器移动至发件箱。已经向Rodolfo提议增加个暗抄选项。
魔改步骤：
1.添加暗抄邮件发送
编辑/app/lib/functions.php在149行后加上以下代码，将"BCC@your.email","your BCC name"替换成你自己的即可。
$mail->AddBCC("BCC@your.email","your BCC name");
2.添加MIAB的邮件过滤器
如果只有一个发件人，则设置“发件人” “包含”，动作为“将邮件移至”“已发送邮件”即可，因为我是2个发件人，所以按以下设置，只要满足一个就生效，anyof意思为“或”，如果是allof则为“和”。
require ["fileinto"];# rule:[保存发件]if anyof (address :contains "from" "SENT1@your.email", address :contains "from" "SENT2@your.email"){fileinto "Sent";}
参考：
[solved]Feature request:Add an option : Sent BCC email.
