For those not familiar with it, Telegram is a popular messaging app with privacy features such as end-to-end encryption on "secret chats" that can only be accessed on the devices they originated on. Because of this it has gained notoriety as a tool used by terrorists and has even been banned in Russia and Iran where it has been deemed a tool of social dissidents. Nevertheless, Telegram is a well-done app for simple, fast and secure messaging.
Email and Messaging
Sending group text messages or iMessages is a convenient way to have a conversation with multiple contacts using iOS. Going back to a message thread will resume this conversation with the same people. So is it possible to add or remove one contact from the list of people already on the group text?
You may have noticed that some of your iPhone text messages have either a blue or green background.
A blue background means that the message exchange is happening via iMessage with another iOS device (an iPhone, iPad, iPod Touch, Mac, etc). These messages are sent through your cellular provider's data network or via WiFi (no cell service needed), and text message rates don't apply
If you try to send an email from your iPhone on iOS 8, or an earlier iOS for that matter, and get an error message that says "A copy has been placed in your outbox. The recipient was rejected by the server because it does not allow relaying," chances are you need to check your outgoing mail server settings. Here's how:
1. Go to Settings -> Mail, Contacts, Calendar and tap on your email account.
2. Tap on "Account," then go down to the "Outgoing Mail Server" section and tap on "SMTP."
3. Tap on your Primary Server.
Sometimes when you start a new email message, iOS suggests an email address that's no longer being used, and has already been removed from your Contacts. How can you tell your iPhone, iPad or iPod touch to stop using that address when you enter a contact's name? Here are instructions on how to remove this old email address from the list.
First open the Mail app and start a new message. Start to enter the name of the contact. You will see a list of suggestions from contacts and the recently used email addresses.