我已经在Mailgun服务中注册了
，但我找不到任何教程来配置PostFix使用Mailgun的SMTP
提示：我的服务器正在使用CentOS 7
我已经找到了其他服务的这些教程，但效果很好
https://support.rackspace.com/how-to/setting-up-a-mail-relay/
https://mandrill.zendesk.com/hc/en-us/articles/205582187-how-to-use-postfix-to-send-send-email-with-mandrill
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