UNABLE TO SEND E-MAIL TEST EMAIL OR CONFIRMATION EMAILS

Hello,

I added subscribe by email plugin but nothing seems to work, I tried to send a test email which I dint receive in my email. I then tried to add my email to the subscriber list but I dint receive the confirmation email. Also, I made a post and set the settings to send email immediately when a post is published but I dint receive any email for the new post that was published.