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Email Delivery Error (Outlook)

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Dear support team,
I am experiencing an issue with your SMTP plugin. I’ve set up WPForms with WP Mail SMTP Pro using Microsoft Outlook (Exchange). Most of the time, it works. However, after approx. 24 to 48 hours, it shows the following error message:

– – – – – – – – – –
EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v2.3.1 logged this error during the last time it tried to send an email:
Mailer: Outlook
InvalidAuthenticationToken: Access token has expired.
Date: 2020-09-11T19:39:15
Consider running an email test after fixing it.
– – – – – – – – – –

As soon as the warning pops up in the WordPress dashboard, no emails will be delivered anymore. The strange thing is: without changing any settings, I only have to send a test message and from that time on, messages continue being delivered.

What could that be?


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