Failure to send out email via gmail

Can someone please help?
I received the following error when I configure sendpress for gmail:

The following From address failed: [email protected]
SMTP server error: 5.5.1 Authentication Required. Learn more at
530 5.5.1 https://support.google.com/mail/bin/answer.py?answer=14257 gn2sm23994842pbb.22 – gsmtp

SMTP -> FROM SERVER:220 mx.google.com ESMTP gn2sm23994842pbb.22 – gsmtp

SMTP -> FROM SERVER: 250-mx.google.com at your service, [207.158.10.54]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH XOAUTH2
250-ENHANCEDSTATUSCODES
250 PIPELINING

https://www.ads-software.com/extend/plugins/sendpress/