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How to Send Email With Mailx Using STARTTLS

edited Jul 29, 2022 3:28PM in Linux

Applies to

Oracle Cloud Infrastructure - Version N/A and later

Linux OS - Version Oracle Linux 7.0 and later

Linux x86-64


How to send email to a remote mail server, using SSL STARTTLS to encrypt the connection, from the command line using mailx?


The solution proposed in this document will use a remote mail server protected by SSL using mailx.

Since by default Oracle Linux mail system does not include public certificate authorities (CA), this procedure will include the process to obtain the certificates from the mail server.

1. Obtaining the certificates

  • Create new certificate and key databases.

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