12-29-2025, 05:43 PM
![[Image: mailersend.png]](https://forum.whmcsservices.net/cn/mailersend.png)
That's because your whole WHMCS system does not use the same Domain name that you registered with MailerSend
Gabriel
Technical Analyst I
WHMCS Services
Technical Analyst I
WHMCS Services
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Why I get this error Validation
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