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I am trying to send mail from R to outlook via mailR package, but I keep getting error whenever I try to run it. Here's my code :

library(mailR)

send.mail(
    from = "me@companydomain.com",
    to = c("coworker@companydomain.com"),
    subject = "Test Email",
    body = "testing",
    authenticate = TRUE,
    smtp = list(
      host.name = "smtp.office365.com",
      port = ` 587,
      user.name = "me@companydomain.com",
      passwd = "Password",
      tls = TRUE
    ),
  authenticate = TRUE,
  send = TRUE
)

The error is get is

    org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.office365.com:587
    at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1410)
    at org.apache.commons.mail.Email.send(Email.java:1437)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at RJavaTools.invokeMethod(RJavaTools.java:386)
Caused by: com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.office365.com, 587; timeout 60000;
  nested exception is:
    java.net.UnknownHostException: smtp.office365.com
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2053)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:697)
    at javax.mail.Service.connect(Service.java:386)
    at javax.mail.Service.connect(Service.java:245)
    at jaNULL
vax.mail.Service.connect(Service.java:194)
    at javax.mail.Transport.send0(Transport.java:253)
    at javax.mail.Transport.send(Transport.java:124)
    at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1400)
    ... 6 more
Caused by: java.net.UnknownHostException: smtp.office365.com
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:310)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:236)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2019)
    ... 13 more
Error: EmailException (Java): Sending the email to the following server failed : smtp.office365.com:587
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