WordPress Gmail SMTP Plugin – Emails Don’t Send and No Error Displayed

When sending a test email, it was hanging on the authentication method:

Auth method requested: XOAUTH2
Auth methods available on the server: 
LOGIN,PLAIN,XOAUTH2,PLAIN-CLIENTTOKEN,OAUTHBEARER,XOAUTH

Installing curl resolved it. For Debian and Ubuntu:

apt-get install curl libcurl3 php5-curl

 

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