Automatically move an email into a folder

Question

I have a website in PHP sending multiple email to its users.

Because I need to be able to debug emails, I've created an email account ([email protected]) and, I've added this email address to the BCC field of every email my server send.
It's been very useful, but I've underestimated the number of email my server is sending and the inbox of this account is becoming very messy.
What I would like to do is, either through configuration or through scripting, automatically put emails into a specific folder based on their subject.

For example every email matching the regex below should be put inside a "Welcome" folder

/Welcome to my website ([A-Za-z0-9])\w+/g

How can I configure my server/Create a script to automatically organize an email account's inbox based on email subject ?

My website is using Apache2, php5.6, Postfix and dovecot.

Answer 1

• dovecotshould be installed with pidgeonhole and managesieve support.
• MTA (postfix) should be configured to use dovecot-lda instead of internal LDA.
• Email-client like Thunderbird should be configured to be able create sieve rules on the server.
• Proper subfolders should be created and subscribed within IMAP maildir.

If all prerequisites are fulfilled you can create the script like that:

require "fileinto";
if anyof (header :contains "Subject" "Welcome to my website")
{
   fileinto "Welcome";
   stop;
}