How to mark read mails as unread in Postfix

 email - How to mark read mails as unread in Postfix - Unix & Linux Stack Exchange

In our postfix server, the mail directories cur and new are under /home/<user>/Maildir. I don't have much of an experience with mail servers, but I am aware that new e-mails land in the new folder first, and once read, they get moved to the cur folder.

[root@imap01 cur]# ls | head -5
1414497605.Vfd02I42dcbM893399.imap01.xyz.com:2,S
1414497605.Vfd02I42dceM901537.imap01.xyz.com:2,S
1414497606.Vfd02I42dcfM227925.imap01.xyz.com:2,S
1414584047.Vfd02I42deeM736282.imap01.xyz.com:2,S
1414584047.Vfd02I42df0M736415.imap01.xyz.com:2,S
[root@imap01 cur]#pwd
/home/userabc/Maildir/cur
[root@imap01 cur]#

The :2,S suffix is getting added to the files once they are moved to cur. Now my questions are:

• How can I mark a read mail as unread through commandline?
• Is it as simple as moving the mail from cur folder to new folder?
• Is it as simple as removing the :2,S suffix from the mail files ?

Turns out that all we had to do was to combine the last 2 steps I had asked in the question.

Copy the e-mail file, (ie. 141443305.abc123abc.imap01.xyz.com:2,S) from /home/<user>/Maildir/cur to /home/<user>/Maildir/new and rename it by removing the :2,S suffix. This process marks the read mail as unread.