If your posts today @ 01.53 and 12.47 are in response to Sleeping's post yesterday, I don't understand why you've responded the way you have Hithere.
Sleeping has not been told that the cards she sends are unwelcome; "He hasn't asked me to stop so I just continue". You appear to be responding based on your personal experience of receiving unwanted communication from your own EP's.
I agree that if an EAC tells their EP's they don't want to be contacted in any way shape or form, their wishes should be respected. However, that is not the only response some EP's receive. Sometimes there is no response at all and TBH if an AC feels strongly enough to estrange their parents in the first place, I find it difficult to comprehend that they would be unable to tell the parents they've estranged, to desist from sending cards.
In Sleeping's situation and for any EP who sends cards and has not been asked not too, I don't agree that it is harassment or even that it is unwanted. If it were, they would be told.
As EP's often say Bridie, we're damned if we do and damned if we don't which is why I believe that in the end, we should do what is right for us and put ourselves first in the decision making process.