How do I check the postfix queue size?

You can check the size and status of the Postfix mail queue using the postqueue command. To view the size of the queue, follow these steps:

1. Open a terminal or SSH session to your server.

2. Use the postqueue command with the p option to display the current mail queue status, including the number of messages and their total size:

    

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   postqueue -p
   

   This will display a list of queued messages along with their queue IDs, size, arrival time, sender, and recipient information.

   Here's an example output:

    

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   -Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
   BBFBE12345      1024 Mon, 01 Jan 2023 10:00:00 +0000 sender@example.com
                                            recipient1@example.com
   
   CDEFG67890      2048 Tue, 02 Jan 2023 15:30:00 +0000 sender2@example.com
                                            recipient2@example.com
   

   In the example above, you can see two messages in the queue, each with their respective Queue ID, size (in bytes), arrival time, sender, and recipient information.

   If you only want to display the number of messages in the queue without the detailed listing, you can use the postqueue command with the -c option:

    

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   postqueue -c
   

   This will simply output the number of messages in the queue, like this:

    

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   2
   

   This indicates that there are two messages currently in the queue.

   Monitoring the Postfix mail queue can help you keep track of email delivery on your mail server and diagnose any issues related to email processing.

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