Dev License: This installation of WHMCS is running under a Development License and is not authorized to be used for production use. Please report any cases of abuse to abuse@whmcs.com

This error generally occurs when SmarterMail service is unavailable.


Follow below mentioned steps to determine that SmarterMail service is started:

  1. Go to Run and type services.msc
  2. Locate the SmarterMail service
  3. Make sure it is started.
  4. If not, start it.

Note: Make sure you do not start SmarterMail Web Server.
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