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answer Could not connect to SMTP host.

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Connection could not be established with host smtp.gmail.com :stream_socket_client(): unable to connect to tcp://smtp.gmail.com:587 (Network is unreachable)

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Connection could not be established with host smtp.mailtrap.io :stream_socket_client(): Unable to connect to tcp://smtp.mailtrap.io:2525 (Connection refused)

Connection could not be established with host smtp.mailtrap.io :stream_socket_client(): Unable to connect to tcp://smtp.mailtrap.io:2525 (Connection refused)

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Message could not be sent. Mailer Error: SMTP Error: Could not authenticate.

unable to send email using php smtp. your server might not be configured to send mail using this method.

mail(): failed to connect to mailserver at "localhost" port 25, verify your "smtp" and "smtp_port" setting in php.ini or use ini_set() in

mail(): failed to connect to mailserver at "localhost" port 25, verify your "smtp" and "smtp_port" setting in php.ini or use ini_set()