Any suggestions on what Should I write to a home wrecker?

honestly there isnt too much you can say thats going to bother her. shes got "her man" now, so who cares. years down the road when shes being cheated on by this loser she will feel like crap...and your friend will be vindicated. this other woman actually did her a favor. the two of them deserve each other

"My best friends husband left her for a girl 10 years younger"

the key words here are "LEFT HER" If anything you should be writing a letter to the exhusband not the new girl. The husband is the one that left his home and wife so how can you be mad at the girl and not him. It shouldnt be what you think of her it should be what you think of him

How about keeping it to yourself. If your friend is anything like you in terms of getting into other people's business, I completely understand why he left her. And what is wrong with replacing her with someone 10 years younger? How is that relevant? Would she feel better if he go together with someone 10 years older and uglier? I found one 10 years younger myself, and I left my ex for very good reasons. I'm not seeing an issue here.

Honey, I suggest saying nothing and mind your own business. I don't mean to be rude. But you probably don't know the whole story. And maybe your energies would be best put to use for your friend at this time...in a positive way.

You should just say out of it as it isn't any of your business. Also, the person people should be mad at is the husband who left and easily strayed. Put the anger and hate where it belongs.

why were you 'best friends' with a married woman? Her best friend should have been her husband in the first place.

Yah sure, write her, she will get a kick out of it and smile.

Grow up, mind your own business and leave the mistress alone, it isn't her fault at all.

Hey...you could thank her. Now with him out of the way, you can be a best friend with benefits!

Why dont you say something about how inappropriate it is to get involved in other peoples personal business...oh wait...

Leave her alone. Y get mixed up in all that mess. Remember that karma is a biotch.