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Install a certificate on sendmail

First, you will need your private key file (not encrypted), your certificate file (cert-0000000000-1234.cer file), and your certificate chain file (chain-0000000000-1234.txt file).

If you haven't ordered your certificate yet, and want to generate a private key and a CSR, you can read our OpenSSL documentation.

Install

Then, edit your .mc configuration file and add/edit the following lines:

  define(`confCACERT_PATH',`/etc/mail/ssl/certs')
  define(`confCACERT',`/etc/mail/ssl/chain-0000000000-1234.txt)')
  define(`confSERVER_CERT',`/etc/mail/ssl/cert-0000000000-1234.cer')
  define(`confSERVER_KEY',`/etc/mail/ssl/privatekey.pkey')

Field description:

  • confCACERT_PATH: Directory containing the server's Certification Authorities
  • confCACERT: intermediate certificate file
  • confSERVER_CERT: certificate file
  • confSERVER_KEY: private key file

You can then restart sendmail.

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