On generate quote, the emails are fired, we are using travelzunlimited.com mail server maxauth.truemail.co.th for firing all emails.
Currently there is a problem in this SMTP server and that’s why the emails are not fired on generate quote and error is generated.
Please forward the attached screenshot to the service provider and raise a support ticket to resolve this issue urgently.
Samarth, the quote is getting generated and there is issue with email only, so you can download the quote by editing the quote from quote->all and download quote from there