SMTP relay for office365 email alerts

SMTP relay for office365 email alerts

Gday all, i have created an SMTP relay and included that IPV4 with the SPF so it allows from the sending IP so i can get my alerts from desktop central.
The issue i have is, if i change the mailserver to the MX record of the new office365 and click test email on port 25 it works.
If i also use authentication it works but i didnt want to have to rely on using smtp auth with TLS, hence the relay.

Is there a way to force it to use the relay as it works but when i click save it says it cannot authenticate?

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