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https://support.office.com/en-us/article/Sent-email-in-Outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
Delivery failures, or emails that bounce or come back as undeliverable, can happen for several reasons. When you send an email and receive a delivery failure message, there could be several reasons.
https://www.socketlabs.com/blog/diagnosing-smtp-service-connection-issues/
Initial SMTP Service Connection Troubleshooting Steps. If you are having problems connecting to smtp.socketlabs.com there are some basic tests that can be performed to try …
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