When an email provider shuts down it's servers, that will effect any subscriber on your list using that service. This will likely result in a higher than average bounce back or undeliverable percentage for your messages.
The following domains are no longer in existence:
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Sify.com
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Orange.net
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Orangehome.co.uk
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Wanadoo.co.uk
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Freeserve.co.uk
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Fsbusiness.co.uk
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Fslife.co.uk
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Fsmail.net
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Fsworld.co.uk
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Fsnet.co.uk