If you are using Google suite or Office 365 and have 2-factor authentication enabled, you need to connect your email account via SMTP/IMAP servers. 

When connecting the email account, enter the app generated password in the SMTP details. 

Here's how you can generated an app password for Klenty:

A. Generating app password if you are using Google suite

B. Generating app password if you are using Office 365

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