What to do if my mail client stops working after switching on SiteGround CDN
To ensure that your local mail client works as normal, follow the steps below:
1. Go to Site Tools > Domain > Subdomains and check if you have subdomain mail.yourdomain.com already and create one if you don’t.
2. Go to Site Tools > Security > SSL Manager and check if you have a Let’s Encrypt WildCard SSL installed on your domain.
If you don’t, choose your domain from the Select domain drop-down menu, choose Let’s Encrypt WildCard from the Select SSL drop-down menu and click on Get.
3. Enter your local mail client settings and change the current IMAP/POP3 and SMTP server settings from yourdomain.com to mail.yourdomain.com. Note that you need to replace yourdomain.com with your actual domain name.