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This error message suggests that the PHP function streamsocketclient() was unable to connect to the specified host "mailhog" on port 1025. It appears that there may be an issue with resolving the hostname "mailhog" to an IP address using the getaddrinfo function.

To resolve this error, you can try the following steps: 1. Check that the hostname "mailhog" is correct and resolvable by your DNS server or your local hosts file. 2. Ensure that the port number 1025 is open and accessible on the target host. 3. Verify that there are no firewall rules or other network restrictions preventing the connection to the target host. 4. Check that the PHP installation and configuration is correct and includes the necessary network modules and settings to establish a connection to the remote host. 5. If none of these steps resolve the issue, try using the IP address of the target host instead of the hostname to establish the connection.

If the issue persists, you may need to seek further assistance from your system administrator or web hosting provider to diagnose and resolve the underlying network or PHP configuration issue.