I would certainly take that Q to cover port blocking.
Traffic management is not normally understood to refer to SMTP access ports, and the context of the whole page is throughput control.
Orange uses the same pro forma to cover their blocking of Port 25:
because they are both following:
Use and availability of services, content, application and protocols on this product
Are any services, content, applications or protocols always blocked on this product?** Yes
If so what? The only restriction we’ve put in place is an email setting that helps protect our customers against unsolicited emails, also known as spam. (For the techies amongst you this means we stop connections to non-Orange SMTP servers on port 25, and block NetBIOS)
BSG Voluntary industry code of practice on traffic management transparency on broadband services Hot!
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC