Article ID: 124618, created on Feb 26, 2015, last review on Jun 17, 2016

  • Applies to:
  • Plesk 11.5 for Linux


When making changes at Home > Tools & Settings > Server-Wide Mail Settings in Plesk Panel, following error occurs:

Error: DNS zone name is invalid.


Server-Wide Mail Settings > DNS zones for DNSBL service field contains an invalid sign/symbol.


DNS zones for DNSBL service must be separated by a semicolon ';' without a space.


Note: If spam protection based on DNSBL service is unchecked and contains an invalid sign, then the error may still occur.

Search Words

postfix/smtp: certificate verification failed for gmail Equifax Secure Certificate Authority

certificate verification failed for untrusted issuer /C=US/O=Equifax/OU=Equifax Secure Certificate Authority

DNS zone name is invalid.

a914db3fdc7a53ddcfd1b2db8f5a1b9c 56797cefb1efc9130f7c48a7d1db0f0c 01bc4c8cf5b7f01f815a7ada004154a2 29d1e90fd304f01e6420fbe60f66f838 0a53c5a9ca65a74d37ef5c5eaeb55d7f

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