Will the confirmation emails and vouchers my customers receive carry my own logo instead of somebody else's?

Yes. On a white label portal the confirmation emails, vouchers and e-tickets that reach your customer are sent under your brand, with your logo, your business name and your contact details on them, so nothing points back to the technology behind the site.

In practice this covers the whole set of documents a traveller normally receives, the booking confirmation, the hotel voucher, the flight itinerary and any cancellation notice. You supply your logo and the wording you want, and those templates are then used for every booking made through your portal. Emails are usually sent from an address on your own domain once you or your IT person add a couple of records to your domain settings, which is what makes them arrive looking like they came from you rather than from a third party.

There are two honest limits. The first is that some documents are produced by the supplier and not by us, an airline e-ticket being the clearest example, so those carry the airline branding as they always would, and that is normal and expected by travellers. The second is that how far you can restyle the templates depends on your plan, since some setups allow a logo and colours while others let you rewrite the layout and the wording completely.

The best next step is to send yourself a test booking, look at every email and voucher it produces, and tell us anything that still does not read the way you want.