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For allowing users to register, reset passwords etc WordPress stand-alone installation needs to send emails.

Solution: You need to install Postfix 

For Ubuntu:

Postfix can easily be installed through apt-get:

sudo apt-get install postfix

Resources:

https://www.digitalocean.com/community/questions/do-i-need-to-install-a-mail-server

https://www.digitalocean.com/community/articles/how-to-install-and-setup-postfix-on-ubuntu-12-04

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