when I send mails to some non yahoo addresses, I get failure notice so the...

...message can never be delivered? I have sent mails several times to aliceadsl or sfrcegetel addresses but none can reach the addressee properly and I get a failure notice a few while after. This also happens when replying to the message very simply, without typing the address. How can I solve this problem taking into account that there is no mistake in the address?
 
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