It seems like you have set your SMTP server to 41.181.159.136, and if that's the case please change the SMTP server to your hosting server or change it to smtp.afrihost.co.za. That IP is not any of the SMTP server's IP on the smtp.afrihost.co.za. Please also refrain from using the IP as the SMTP server for your mails on your mail client because most SMTP servers, especially ISP SMTP servers use multiple IP's. Please send more details about your account to answers@afrihost.com.