If you are using an SMTP plugin in order to send email from your website (i.e. for contact forms, etc) then you will need to ensure your SMTP settings are setup correctly. This depends entirely on the email provider you have connected with your SMTP plugin, for example here are the Gmail SMTP settings:
https://support.google.com/a/answer/176600?hl=enLast modified: 28 Jul, 2015
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