Message from unknown but she's in contact list

Books and other info is sent to kindle by your registered email address. Log onto kindle Look for account and lists below the search bar and to right side. Hold cursor there and look down list to Manage content and devices. Click that. On right side click settings. That will give you a list of all the registered info on your device also an option to change any of that info. If you send personal files to your kindle you will also have to change the approved senders list, near bottom of page or you kindle will not accept anything from unknown senders. Any further problems you can try these to contact customer service direct.
To contact us via phone:
http://www.amazon.com/clicktocall

To contact us via chat:
http://www.amazon.com/clicktochat

There are different methods to block text message sender on iPhone. I will show you one of them. Just follow the steps as below.

This works really well for blocking phone number on iPhone, like phone numbers from some unknown spammers, advertising companies and internet marketers bothering you with promotions and offers for products that are not at all related to your interest. These steps will block only those unknown callers that you choose to block. The detailed steps are as follows:
1. Go to the Messages app.
2. Tap on the target message from the spammer.
3. Choose "Details" on the top right hand corner and tap on it.
4. There will be phone icon and a letter "i" icon across from the number. Tap on the "i" icon.

5. Scroll down to the bottom of the page and then tap on "Block Contact".

Note: Once you press on Block Contact, the phone number that you just blocked won't be able to make phone calls, send text messages, or Facetime you.

For more methods, check: How to Block A Number on iPhone

Most Post paid services (contract based) have the ability to block certain numbers by request or even there website

i faced this problem too....please go to contacts -) options-) settings-)

change show contacts of....both sim and phone....add contacts saved to phone memory....

You have to have the senders' name and number stored in your phonebook/contacts before it can show when you receive messages/calls from them

Probably it is asking you to add the email to safe sender's list so that it is not caught in the junk emails.
If you like the emails from this sender, you can do what it is asking.
Normally I don't follow such instructions from unknown sender's emails.

your problem is maybe about auto send massage setting. first to check them. if don't find your problem and your phone warranty period so can reach Samsung service center. otherwise you also update your phone using Samsung PC studio ( downloaded from samsung official website)

1. Flip open your cell phone and go to the phone's menu.
   

2. 2

   Select "Settings" and scroll down to "Calls."
   

3. 3

   Select "Manage Calls" and then choose "Accept Calls."
   

4. 4

   Choose to accept "All Calls," "Calls from a list" or "None." If you choose to accept calls from a list, you will have to create your list of accepted callers. This is easy. You will just scroll through your contacts and select numbers you want to accept
   

hope this helps

John

start the message and the hit menu add recipients then hit name you want repeat for each name you want to add