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  1. Sendmail - Wikipedia

  2. Linux Sendmail Command Help and Examples - Computer Hope

  3. What Is Sendmail? Definition, How it Works & More - Proofpoint

  4. How to use Sendmail – DreamHost Knowledge Base

  5. How to Install and Configure Sendmail on Ubuntu …

  6. Software for e-mail - Sendmail Open Source

  7. BASIC INSTALLATION - Sendmail Open Source

  8. sendmail(8) - Linux manual page - man7.org

  9. Sendmail - ArchWiki

  10. NovoSial.org: Sendmail Documentation

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