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:
- Sify.com
And these domains will stop supporting email effective May 2017.
- Orange.net
- Orangehome.co.uk
- Wanadoo.co.uk
- Freeserve.co.uk
- Fsbusiness.co.uk
- Fslife.co.uk
- Fsmail.net
- Fsworld.co.uk
- Fsnet.co.uk