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Swift_TransportException: Connection could not be established with host

Please confirm that you are using the correct parameters to connect your web application with your email account.

Even if you're confident about using the correct parameters, it's worth double-checking. The necessary parameters to connect to your email account can vary from time to time, depending on the software vendor (for example, cPanel, Directadmin). Changes might occur due to technical adjustments, security updates, or other reasons.

The last time we encountered this issue, our advice was the same as what we've just suggested. Our client successfully resolved the problem by updating the required parameters to connect with their email account.

If you've confirmed that the parameters to connect with your email account are accurate and you still need help, please don't hesitate to reach out to us.