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Hi @dssunil,
Can you please let us know if you have configured any SMTP connection on your site? In order to send emails using FluentCRM you would need an SMTP.
If you do not have any SMTP configured, FluentCRM will use the default WordPress mailing feature which has a low email deliverability and the email sending will fail in most cases. You can use FluentSMTP and configure an email-sending service.
Thank you!