When a user tries to write to the queue directory without needed rights, then the error “queueup: cannot create queue file” in Sendmail appear. At Bobcares, with our Server Management Service, we can handle your issues.

Fixing the error “queueup: cannot create queue file” in Sendmail

The following are some of the causes and its respective fixes for the error in Sendmail:

1. User/process lacks write permissions.

Fixes:

1. Change ownership: sudo chown bobcares:bobcares /var/spool/clientmqueue

2. Adjust permissions: sudo chmod 775 /var/spool/clientmqueue

2. Queue files lack necessary write rights.

Fix:

1. Ensure ownership of queue files (qf*, df*) by the correct user.

2. Set permissions to 600 or 660 for these files.

3. User/process is not in the owning group.

Fix:

1. Add user to group: usermod -aG bobcares

2. Verify group membership with groups .

4. Mismatched user ID or group ID.

Fixes:

1. Ensure user/process has the same IDs as the directory owner.

2. Update IDs if necessary to match.

5. Sendmail daemon lacks SUID permissions.

Fix: Set SUID bit: chmod u+s /usr/sbin/sendmail

6. Too many files in the queue directory.

Fix: Clear queue manually: xcomqm -R* (resubmit transfers afterward).

7. Shared memory is full.

Fix: Set up shared memory properly and set a reasonable value for MAX_QUEUE_ENTRIES.

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Conclusion

By addressing these issues, we can resolve the “queueup: cannot create queue file” error in Sendmail.