Hi Rinkal,
Could you share me the reason that why it is required to send transactional emails?
Transactional messages are typically regulated differently from commercial messages(emails that for bulk delivery with customer journey). They are considered personal communications and related exclusively to a specific transaction between your organization and another individual or organization, not promotional communications, and therefore have different content and consent requirements. (Such as a receipt, account statement, or consent request)
With an intuitive example: when creating an marketing email from template and adding "Legal designation: Transactional" as filter, there are only 3 templates:
"custonaci" and "diamante" are used to send confirmation email of consent level change and subscription list change when global double opt-in is enabled;
"form-doubleoptin" is used to send confirmation email of subscription list change when form double opt-in is enabled.
Instead of via customer journey, these emails will be sent to contacts automatically after they changed consent level or added a new subscription list, while send now" option will create a simple customer journey to send the email shortly, therefore, the button won't be available to transactional emails.
Regards,
Clofly