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Qmail directory structure

Qmail installation folder is /var/qmail. All Qmail folders are located in /var/qmail

1. Qmail main folders

Qmail main folders are given below.

1. alias   
.qmail files used for system-wide aliases are stored in this folder.

2. bin   
Qmail programs and scripts are located here.

3. boot    
Qmail startup scripts are placed in this folder.

3. control   
Qmails configuration files will be in this folder.

4. doc   
This folder is used for placing Qmail documentation files.

5. man   
Qmail man pages can be found in this folder.

6. queue   
This is the Qmail  queue

7. users   
Information about Qmail users are stored in this folder


2. Folders in Qmail Queue


1. bounce    
Bounce mails are stored in this folder

2. info    
Email sender addresses are stored in this folder.

3 intd   
Headers are added to email at this folder.

4. local    
Local email addresses of emails tobe delivered locally.

5. lock    
This folder contains lock files.

6. mess   
Email messages are stored in this folder.

7. pid   
Email first arrives in this folder. This email is named using i-node number of the file. Then email is moved to mess folder.

8. remote*   
Remote mail addresses of emails tobe delivered remotely.

9. todo    
This folder also stores email headers.


3. Important Points
  • info, local & mess folders contain 23 sub folders with names "0", "1", ..., to 22. This helps to reduce the number of files in a single folder.
  • We can't modify files in mess sub folders since they are directly related to i-node number.
  • It is not at all safe to play with Qmail queue, especially when qmail is running.

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