emails blocked

[Dollie]

I'm with o2 as is my email address. Within the last week I have noticed something peculiar. Whenever I send emails, the ones that are to Aol email addresses are always returned, whilst others always go through. This is a new thing as I have always been successfully able to send to these two people on the aol address before. I dont think I have altered any settings or anything - can anyone give me a clue as to what is happening ? TIA

[wildwood]

I can only suggest that you double check the e-mail addresses to make sure there is no error.
It may also be that these two have there inbox full to the max allowance.