Mail Manager fails to send email to other than linked email id's in crm

Send an email from mail manager,by providing an email id which is not linked with the crm records.It fails to send to the recipient.

Reference:

https://sc.vtiger.in/screenshots/greeshma%20k-sc-at-19-11-2019-18-35-21.png

https://sc.vtiger.in/screenshots/greeshma%20k-sc-at-19-11-2019-18-36-48.png