我正在尝试使Laravel应用程序通过Mailgun发送邮件。我已经创建了子域，并为其包含了所有必需的DNS。子域已由Mailgun验证。
尽管如此，我只能将邮件发送到gmail等知名服务器。当我尝试将邮件发送到某人@ mydomain.com时，即使我在Mailgun帐户中使用了同一封邮件，也收到未找到退回用户5.1.8的消息。
"delivery-status": {
"tls": true,
"mx-host": "ozparts.eu",
"attempt-no": 1,
"description": "",
"session-seconds": 1.3590381145477295,
"code": 550,
"message": "5.1.8 User not found"
},
"recipient-domain": "ozparts.eu",
"event": "failed",
"campaigns": [],
"reason": "bounce",
"user-variables": {},
"flags": {
"is-routed": false,
"is-authenticated": true,
"is-system-test": false,
"is-test-mode": false
},
"log-level": "error",
"timestamp": 1568104990.196678,
"envelope": {
"transport": "smtp",
"sender": "postmaster@mail.aclperformance.eu",
"sending-ip": "141.193.32.19",
"targets": "janusz@ozparts.eu"
},