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mailq Command in Linux with Examples

Last Updated : 22 Oct, 2024

mailq i.e. "mail-queue", this command in Linux prints the mail queue i.e. the list of messages that are there in the mail queue. You should have a mail-server setup on your Linux machine, to use this command, there are ways i.e MTA's(Mail Transfer agent) you can use like sendmail which uses the service smtp. The output of mailq command is similar to the sendmail -bp command that also prints the mail queue.

mailq [options]

The most commonly used options include -v for verbose mode, which provides more detailed information such as message priority.

Simply prints the messages in the mail queue.

$ mailq

Output

 Mail Queue (1 request)
---QID---- --Size-- -----Q-Time----- ------Sender/Recipient-----
SS04506        5    Tue Nov 12 09:01            root
            (User unknown)

Simply prints the messages in the mail queue.

$ mailq -v

Output

 Mail Queue (1 request)
---QID---- --Size-- -Priority- -----Q-Time----- ------Sender/Recipient-----
SS04506        5      2005     Tue Nov 12 09:01            root
            (User unknown)

Here,

• QID: Specific ID allotted to message.
• Size: Number of bytes contained in body of message.
• Q-Time Time at which message entered the queue.

• Managing High Email Traffic: mailq helps administrators monitor email queues, ensuring efficient processing during high-volume campaigns.
• Troubleshooting Failed Emails: It identifies failed messages due to issues like incorrect addresses or full mailboxes, enabling quick fixes.
• Prioritizing Critical Emails: mailq allows adjusting the flow of high-priority messages, such as transactional emails or alerts.
• Tracking Delivery Delays: mailq provides insights into delayed emails, helping with diagnostics and load balancing.

The mailq command is an essential tool for managing email queues in Linux-based systems. It allows system administrators to view the status of emails waiting in the queue, troubleshoot delivery issues, and optimize the flow of outgoing messages. In environments with high email traffic, mailq plays a critical role in maintaining the efficiency and reliability of mail servers.

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