Unable to configure office 365

Hi,

I’m using contact form 7 and suddenly when I fill in the form on the website I get the message: Message is NOT send. Try again.

So I installed Mail Bank to fix this problem, but I can not configure. I filled in the settings but the test mail can not be send.

I filled in the following settings:
smtp.office365.com
587
TLS

And I get his message over and over again:

Controleren van je instellingen
Test mail send to: [email protected]
E-mail status : Not send
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Foutopsporing uitvoer :
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220 VI1PR0802CA0030.outlook.office365.com Microsoft ESMTP MAIL Service ready at Mon, 18 Sep 2017 11:22:38 +0000
EHLO localhost
250-VI1PR0802CA0030.outlook.office365.com Hello [2a00:d10:1141:5::5]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8
STARTTLS
220 2.0.0 SMTP server ready
EHLO localhost
250-VI1PR0802CA0030.outlook.office365.com Hello [2a00:d10:1141:5::5]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-AUTH LOGIN XOAUTH2
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8
AUTH LOGIN
334 VXNlcm5hbWU6
aW5mb0BhYmN0cmF2ZWwubmw=
334 UGFzc3dvcmQ6
RHVjYWEwNTM=
535 5.7.3 Authentication unsuccessful [VI1PR0802CA0030.eurprd08.prod.outlook.com]

Your Web Host provider may have installed a firewall between you and the server.
Contact the admin of the server and ask if they allow outgoing communication on port 25,465,587.
It seems like they are blocking certain traffic. Ask them to open the ports.
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