If customers are not receiving email confirmations from you when you confirm and save their booking the first thing to check is whether you have the automatic confirmation option ticked in Settings.
Go to Settings:
> select venue name
> Booking Types
Within each Booking Type > Emails
Below ‘Enquiry received message’ and ‘Booking Confirmed Message’
> Automatic confirmation
Tick the box
This sends out a confirmation email when you Confirm and SAVE an enquiry in Collins
If you do not have this ticked you will have to go to the Messages section of that booking and manually send out a confirmation email. Make sure you click the green SEND button when you are happy with your message.
There may also be other factors stopping emails reaching the customer, such as:
> it may filter into Spam - in this case you will need to ask the customer to mark you as safe.
> their inbox maybe full> for corporate clients, quite often they have very strong spam filters and so the email will not deliver. The system will notify you of this and I would then recommend to contact the customer on the phone to reach them at a personal address. Or ask them to mark your address as safe and then resend the email.