Emails fail to send and the following message can be seen in the WP logs:
U00050029 The SMTP client cannot connect to the SMTP server '<SMTP server here>', error code '10060', error description: 'timeout detected'.
This indicates a network issue or a problem on the SMTP server
1. Work with the admin on the SMTP server to determine what caused the issue
2. Increase the SMTP_TIMEOUT in the UC_CLIENT_SETTINGS