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  1. Spring AMQP
  2. AMQP-741

String[] headers such as mail_to and mail_cc are not rendered properly though RabbitMQ

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      I’m using spring-cloud-starter-stream-source-mail with RabbitMQ and found String[] headers such as mail_to and mail_cc are sent as String[]#toString

      These headers are created in MailUtils.
      https://github.com/spring-projects/spring-integration/blob/v4.3.9.RELEASE/spring-integration-mail/src/main/java/org/springframework/integration/mail/support/MailUtils.java#L53-L55

      We should have an option to render `String[]` headers as comma separated strings or other format.

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            Assignee:
            grussell Gary Russell
            Reporter:
            making Toshiaki Maki
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