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mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" - YouTube
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php - Error "Failed to connect to mailserver at localhost port 25" after installing userpie - Stack Overflow
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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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