What are the risks associated with switching Internet Service Providers and/or Telco providers (i.e. Telstra -> Optus), if any?

This is in relation to a larger organisation with a wide area network.

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    The only thing I currently can think of is the new IP addresses you'll get could be black-listed on some RBL. In addition to that I can see that switching might cause outage to certain systems. – Jeroen Aug 3 '15 at 4:18
  • Thanks Jeroen. I didn't think of that. The topic of blocked IP addresses made me think of an additional issue. Telstra might have a list of blocked IP addresses that prevent SPAM from reaching customers. Optus would probably have a similar list, but there is a possibility it differs greatly to Telstra. So switching IP providers might result in greater susceptibility to SPAM and attacks in general? – KimberleyK Aug 3 '15 at 5:27
  • @KimberlyK: Yes, that's my thought. Although the likelihood is small. Can't you contact Telstra and discuss this with them? Or ask them which block you'll get, so you can do some research? – Jeroen Aug 3 '15 at 6:18

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