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https://www.howtogeek.com/305093/what-is-a-500-internal-server-error-and-how-do-i-fix-it/
Jul 12, 2017 · If you try to visit a website and see a “500 Internal Server Error” message, it means something has gone wrong with the website. This isn’t a problem with your browser, your computer, or your internet connection. It’s a problem with the site you’re trying to visit.
https://www.lifewire.com/500-internal-server-error-explained-2622938
In most cases, a 500 Internal Server Error is due to an incorrect permission on one or more files or folders. In most of those cases, an incorrect permission on a PHP and CGI script is to blame. These should usually be set at 0755 (-rwxr-xr-x). A PHP Timeout.
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://knowledge.broadcom.com/external/article/177591/email-remains-in-the-delivery-queue-with.html
<p>The Symantec Messaging Gateway (SMG) connects to the downstream server successfully, but does not receive a response. SMG considers this a successful connection with a transient failure in delivery and will continue to attempt to send to the problematic MX record.</p>
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-1-10-in-exchange-online
In the Accepted Domain dialog box, set the domain to Internal Relay, and then select Save. Manually synchronize on-premises and Office 365 directories. If you have a hybrid configuration and the recipient is located in the on-premises Exchange organization, it's possible that the recipient's email address isn't properly synchronized with Office 365.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-7-1-in-exchange-online
If the recipient is an internal group: You might not have permission to send to the group or to one of its subgroups. In this case, the NDR will include the names of the restricted groups that you don't have permission to send to.
https://oxygensolutions.com.au/kb/what-does-a-o2-delivery-error-message-mean/
What does a ‘O2 Delivery Error’ message mean? This message is displayed on Inogen G3 concentrators. A breath has been recognized, but proper oxygen delivery has not been detected. Check all connections and restart the unit. If the message persists the concentrator may need a service.
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