The image shows why - it's listed as ISP end-user space that shouldn't be sending mail (as iago said). Most DNSBLs forbid mail from these addresses. (Fios is extremely unlikely to fare better once the address ranges used for end users are known.)
Though, in general, I tend to take a dim view of SORBS's policies:
Delisting. If the size of the listing is anything more than a single IP address, delisting can only take place when the spammer is no longer using the address space, in which case the size of the listing will be reduced down to the originally spamming IP addresses free of charge. The affected IPs (the ones used to send the spam) will only be delisted when a donation us made to an acceptable charity or good cause, or when sufficient time has passed, or when SORBS determines that the netblock has been returned to the RIR; see the Spam Database FAQ for details. The charities and good causes SORBS approves will not have any connection with any SORBS administrator either past or present.
That sort of "arrangement" is often known by another name, and not a particularly good one.
