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Replace your Jira/Confluence mail queue with Postfix -- part 2 - Knowledge Base - Red Radish Consulting
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codeigniter - mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() - Stack Overflow
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php - Warning: mail(): Failed to connect to mailserver// Notice: Undefined variable: feedback in - Stack Overflow
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