Assuming there are no issues on your web server configuration and the remote server is online, you may want to check if the SSL Certificate associated with the external entity is valid.
You sent an email, and it was bounced (returned) back to you.
When you try to send an email, this error usually occurs because the email address does not exist in the remote server.
Check the error log file for errors. Coding errors on your website are most likely causing the blank pages.
Use the following settings to read and send email messages in mail clients, like Microsoft Outlook and Apple Mail.
You are trying to login into Roundcube, and the following error appears.
This article will help you find your emails in some situations.
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One of our customers sent us a message similar to the following.
