If you received an email from ShippyPro that tells you that your SMTP Server Connection is in error, don't worry!
You can fix this issue in a few steps by checking your SMTP Credentials from Integrations > Plugins.
Click on SMTP Server to open the configuration banner and check your SMTP Credentials.
Be sure that the credentials are correctly inserted and click on Confirm.
💡Remember to set the server as default through the option on the bottom of the menu.
You'll find below a list of Hostname for the main Providers:
Outlook.com > smtp.live.com
Yahoo.com > smtp.mail.yahoo.com
AOL.com > smtp.aol.com
If yours is not one of these try take a look here.
As well as a list of the main Global Hosting Providers: