公司使用Exchange2013 CU7，最近发送一个国外的客户老是被退信，咨询对方的IT，对方回复调整了邮件网关的设置，已经弃用TLS1.0,让我们升级TLS
问题1：处理此问题是否应该把2013升级到CU19?
问题2：Exchange服务器与其他组织的邮件服务器传输邮件，默认是启用25 SMTP还是25 SMTP STARTTLS?或者是协商？
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