Hello people, I am facing some issues while sending mail from the webclient which is provided by the hosting company. I am using the Horde webmail client to send my emails but I am not able to send even a single email. Whenever I am trying to send emails using Horde, I get the error message saying "code: 550, response: Verification failed for <email address> No Such User Here Sender verify failed". How to resolve this error? Please guide me step by step for this problem.
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