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Sender verify failed virtualmin

What causes “Sender verify failed” SMTP mail error, and how to resolve it in Webmin/Virtualmin Postfix servers

SMTP error from remote mail server after RCPT TO:<>:
host []: 550-Verification failed for <>
550-The mail server could not deliver mail to The account ordomain may not exist, they may be blacklisted, or missing the proper dns entries.
550 Sender verify failed

If you are a Webmin/Virtualmin web host, you would recognize this as one of the common errors reported by your customers.

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Sender verify failed can be caused by issues ranging from improper file permissions to RFC non-compliance. Engineers at Bobcares help desk support services collect detailed information regarding the error through log analysis and engaging the customer. The following are the few of the common causes for this error. (more…)