Is an email notification of a new financial responsibility valid as opposed to a letter in writing received in the mail?

An email can be as valid as a U.S. Postal letter. It might depend on what the rules and regs of your club say about notices.

It is usually OK if someone in the household signs for the letter.

Could the demand letter be use as a notice of claim, or pre sue letter.

There is not enough information here to answer your question. Put in some more facts about your situation so that a proper answer can be written...

What happens when you receive 2 Right to Sue letters from DFEH?

You will want to discuss your situation with a lawyer in more detail. Use the "Find a Lawyer" tab on this site and choose a discrimination lawyer...

Is their policy against our 1st Amendment?

A company can create their own rules for how you use their web site. The TOS on Draft Kings is your contract with the company and you must respect...

While you may lose a Facebook friend, their posts are not protected and you may copy them.

Can I fill charges against my son's estranged wife for sending me "revenge porn"?

Your son is really the victim here. He should call the police about the theft of the phone, He also has a cause of action for her invasion of...

It really isn't economical for them to sue you. However, they may be able to effect your credit rating.

Can I ignore a Citation in a delinquent tax suit sent by certified mail but delivered to my mailbox?

You called the plaintiff lawyers and they asked you to send them a letter. Do that and you can stop worrying about this.

What requirements are there for entrepreneural minors?

Your friend will want to discuss their situation with a lawyer in more detail. Use the "Find a Lawyer" tab on this site and choose a business from...