Check mail server status

Here are some common commands and tools to check the status of a mail server:

1. Check the mail server's status using the postfix command:

• postfix status (for Postfix mail server)
• sendmail -bz (for Sendmail mail server)

2. Check the mail server's logs:

• tail -f /var/log/mail.log (for Postfix mail server)
• tail -f /var/log/sendmail.log (for Sendmail mail server)
• tail -f /var/log/mail (for other mail servers)

3. Check the mail server's queue:

• postfix -q (for Postfix mail server)
• sendmail -q (for Sendmail mail server)

4. Check the mail server's DNS settings:

• dig mx yourdomain.com (to check the MX records)
• dig a yourdomain.com (to check the A records)

5. Check the mail server's connectivity:

• telnet yourmailserver.com 25 (to check if the mail server is listening on port 25)
• nc yourmailserver.com 25 (to check if the mail server is listening on port 25)

6. Check the mail server's authentication:

• telnet yourmailserver.com 587 (to check if the mail server is listening on port 587 for submission)
• nc yourmailserver.com 587 (to check if the mail server is listening on port 587 for submission)

7. Check the mail server's spam filtering:

• spamassassin -D (to check the spam filtering configuration)
• spamassassin -T (to test the spam filtering rules)

8. Check the mail server's antivirus scanning:

• clamav -d (to check the antivirus scanning configuration)
• clamav -t (to test the antivirus scanning rules)

9. Check the mail server's backup:

• rsync -avz /var/log/mail /backup (to check the backup of the mail logs)
• rsync -avz /var/spool/postfix /backup (to check the backup of the mail queue)

10. Check the mail server's performance:

• top or htop (to check the CPU and memory usage)
• iostat (to check the disk I/O usage)
• netstat or ss (to check the network connections)

Remember to replace yourmailserver.com with the actual domain name or IP address of your mail server.