I have a couple good friends in AOL's antispam team. AOL's blocking is semi-automated and triggered partially by end-user complaints, so the block is probably a symptom of some larger problem - either a compromised machine in the network that's being used to send spam, or an over-zealous marketing department sending email to people who don't necessarially want it. Either way, it's probably something that ought to be looked into, even if 'multi-million dollar global company' IT department can tell itself "we don't need to send mail to AOL users".
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