There is no possibility to set mailer credentials "as code". Jenkins Configuration as Code handles smtpHost, smtpPort and useSsl fields, but it doesn't handle useSMTPAuth, smtpAuthUserName and smtpAuthPasswordSecret fields.

Expected result

JCasC plugin should handle useSMTPAuth, smtpAuthUserName and smtpAuthPasswordSecret fields.

Example configuration

unclassified:
  mailer:
    adminAddress: admin <admin@dummy.tld>
    replyToAddress: admin <admin@dummy.tld>
    charset: UTF-8

    smtpHost: smtp.mailgun.org
    smtpPort: 587
    useSsl: false

    useSMTPAuth: true
    smtpAuthUserName: XXXXX@XXXXX.mailgun.org
    smtpAuthPasswordSecret: XXXXX