Networking / Beginners

Sendmail Security

A mail administrator should ensure that no one should be able to get special permissions or privileges in the mail system. You should carefully consider the read, write, and execute permissions that are assigned. An unauthorized user with write access can cause considerable damage. You should provide the minimum permissions required. There are many more security measures that can strengthen sendmail security. Some of these measures are listed here:

  • Check the file and directory permissions. You should ensure that users have only the minimal permissions required.
  • Use the sendmail restricted shell (smrsh) program to limit the programs that can be executed in .forward, aliases, and include files.
  • Use the SafeFileEnvironment option to limit where the file system mailbox files can be written.
[Previous] [Contents] [Next]

In this tutorial:

  1. Linux Other Network Servers
  2. Setting the FTP User Account
  3. Configurations File for FTP Server
  4. ftpusers
  5. Anonymous FTP
  6. Using Proper Password and Group Files
  7. Anonymous FTP Warnings
  8. Sendmail
  9. Sendmail Security
  10. Domain Name Service
  11. Domain Name Space
  12. Services Offered By a DNS Server
  13. DNS Transactions
  14. BIND
  15. BIND Configuration
  16. Resource Records (RR)
  17. Start of Authority (SOA)
  18. nslookup
  19. BIND Security
  20. Host Name Spoofing
  21. Running BIND with Least Privileges
  22. DNS Security Extensions (DNSEC)
  23. SAMBA
  24. SMB Protocol
  25. Mounting the SMB File System
  26. SAMBA Security
  27. Server-Level Security