Email not sent (neither test email)

SupportEmail not sent (neither test email)
Dr. Ojasvi Parashar asked 3 years ago
I'm a beginner, it is a wonderful plugin but email is not sent even test mail. what should I do? below is error from test mail {"wp_mail_failed":{"to":["ojasviparashar@gmail.com"],"subject":"","message":"<!DOCTYPE HTML>\n<html lang=\"en\">\n <head>\n <meta http-equiv=\"Content-Type\" content=\"text\/html;charset=UTF-8\">\n <\/head>\n <body>\n <p>Dear Sunita ,<\/p>\n<p>12<\/p>\n<p>Thank You for booking your appointment with HealthCare Homeopathic Clinics, your appointment with HealthCare Homeopathic Clinics, June 26, 2021 from 11:00 am to 11:30 am for Consultation without Medicine at HealthCare Homeopathic Clinics, Pilani, Near Main Market, Pilani, Pilani is pending. To confirm booking pay 500.00 <a href=\"https:\/\/rzp.io\/l\/YsQwlKl\">Here<\/a> .<\/p>\n<p>Regards,<\/p>\n<p>HealthCare Homeopathic Clinics,<\/p>\n<p>Website- <a href=\"https:\/\/healthcarehomeopathy.online\/\">www.healthcarehomeopathy.online<\/a><\/p>\n<p>for further information mail us to <a href=\"mailto:healthcarehomeopathy1@gmail.com\">healthcarehomeopathy1@gmail.com<\/a><\/p>\n <\/body>\n<\/html>","headers":[],"attachments":[],"phpmailer_exception_code":2}}