If the correspondence is harassing, or threatening, blacklisting is appropriate. However, makes sure it really is. Alas, some women have a hair trigger. In my early hobbying days, I knew there was a good chance of being sent to another city for a week. Well, I went to handy dandy TER, did some research and saved the URLs of the personal web site of three of the ladies I might want to see. Three months later, I was being sent. I relooked at the web sites, choose the lady who seemed most promising, and filled out her web form with two references. I got an email back asking how she found me. I had not relooked at her TER page. She had gone under the radar, and delisted her self from all escort sites. Her personal page was still up. I wrote back that I had saved the URL of her web site on my FireFox three months ago in a candidate list. She wrote both of the references I provided that I was a stalker who maintained a hooker list. Took a bit of doing to mend fences with both ladies. Once they realized what happened, they got a good laugh. Needless to say, number two was engaged on that trip, and my world was rocked.