E-mails Sent From My Macbook Pro Are Going Straight Into My Outbox Not Sent.

Is there a way to undo a sent e-mail in Outlook?

Google's undo feature simply delays sending messages for a few seconds giving you a chance to reconsider and delete the message from the outbox if you decide not to let the message go.  Once the message has left the outbox, there's nothing you can do to recall or undo it.  Outlook has the same ability to delay messages, it's just not automatic.  You have to open the options of each message and set a delay via the "do not deliver before" option. There is a way to make the delay automatic in Outlook and that is to employe some macro code.  The following macro delays every message for X seconds (you get to chose the value of X).  Follow these instructions to add this code to Outlook.  These instructions assume that you have Outlook 2010 or later.Open or switch to Outlook.Press ALT+F11 to open the Visual Basic editor.If not already expanded, expand Microsoft Office Outlook Objects and click on ThisOutlookSession.Copy the code from the Code Snippet box and paste it into the right-hand pane of Outlook's VB Editor window.Click the diskette icon on the toolbar to save the changes.Close the VB Editor.Click File and select Options.When the Outlook Options dialog appears click Trust Center then click the Trust Center Settings button.Click Macro Settings.Select either of the two bottom settings (i.e. "Notifications for all macros" or "Enable all macros (not recommended; potentially dangerous code can run)".  The choice of which option to choose is up to you.  If you select "Notifications", then you'll be prompted at times to enable macros. If you pick "Enable all" then there's a chance that a malicious macro could run.  It's a question of how much risk you want to assume.Click Ok until the dialog-boxes have all closed.Close Outlook.Start Outlook.  Outlook will display a dialog-box warning that ThisOutlookSession contains macros and asking if you want to allow them to run.  Say yes.Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)
'On the next line, set the number of seconds you want messages to be delayed before being sent.
Const DELAY_INTERVAL = 10
If Item.Class = olMail Then
Item.DeferredDeliveryTime = DateAdd("s", DELAY_INTERVAL, Now)
Item.Save
End If
End Sub

How do you logout of your mail account on a Mac?

If you're accessing your email through a web browser, simply look for the Logout or Sign Out link on your webmail page (in Gmail, for instance, that can be found by clicking on your account icon in the upper right of the page and select Sign Out).If you're referring to a stand-alone email client such as Apple's Mail or Outlook for Mac, there is no "log out" since the client is basically just a database that's storing your mail offline, it's not a website. You can choose to not store your password in that app (or remove it from the keychain if you've already saved it) so that you have to enter your password every time you open the app before you can send or receive new messages, but anything already downloaded will still be accessible since it's an app, not a website.If you're worried about securing your information when you're away from your computer, just set your security preferences (in System Preferences > Security & Privacy > General) to "require password" _x_ minutes after sleep or screensaver, and then set your energy saver or screensaver  setting to a low number (or you can use the logout or sleep commands from the Apple Menu or the Login Window option that's in the Fast User Switching menu if you have that enabled.)

How do I change the display sender name for your emails in Outlook?

If you want to change the sender name for your emails in Outlook then follow the below steps.Open MS Outlook Go to File > Info > Account SettingIn Account Setting, select email account that you want to change the name and then Click Change button.Then Change Account box pop up, go to the User Information and Change the display name. Click Next button.After clicking Next button, Text Account Setting dialog will display, wait until the process are completed and then click Close button. Click Finish button in the Change Account dialog box.Return to the Account Setting dialog box, Click Close button to close it.When someone received your emails, then will see the display name is change.

When I send a photo from my iPad (or iPhone) via email, how do I change the 'default' email address it is being sent from?

Hi,To change the default email address, follow the instructions below:Launch Settings from your Home screen.Tap Mail, Contacts, Calendars.Scroll down and tap Default Account.Tap the account you would like to use as your default mail account.Even though this change is made in a Contacts menu, your iPhone or iPad will remember which account is the default for sending emails.Cheers!

Why do messages on Facebook Messenger sometimes change from "seen" to "delivered"?

Paul Olaru is correct.  I am not sure what version of Messenger you're using, but "Seen" means the person opened their chat or Messenger to the conversation.  My version of Messenger doesn't have "Delivered" as a status message, but it says "sent" if the message has not yet been opened by the recipient (Apple's iMessages shows "delivered" if the message was sent but not opened, and "read" if it was opened).  In Messenger specifically a "seen" message may have a little circle with a miniature of the recipient's profile picture next to the message to indicate that she's opened it; a "sent" but not opened message has a check-mark next to it.Edit: Combined three answers on merged questions.  This question is very merge-worthy; I rarely go more than a couple days without a new A-to-A on the exact same question.  I won't be answering it in the future, nor any similar question, because there's not much to add.  Hopefully one of these answers will be helpful.Originally Answered: I sent someone a private message on Facebook, and their profile picture icon showed up, indicating that they read it. When I look at the icon next to our last two conversations, it is a white circle with a blue checkmark. Does that indicate that they marked it as unread or deleted the message?It usually means they haven't looked at the latest message in the conversation, whatever that may be.  You got the "seen" icon for any messages that were there the last time they went into the conversation, but if you have sent a new one since then they might not have "seen" it.I've seen numerous questions on Quora asking about the following: If you had a "seen" icon and it changed back to a blue circle without you sending any more messages in between? That I think must be a database glitch—I have attempted several times to recreate such a situation with my computer, phone, and a dummy FB account that I mostly use for testing, and I wasn't able to recreate a situation like that when I experimented with it just now.  I've never seen it in the "wild", either.  And as of today, 20 September 2015, FB aren't marking messages "Delivered" on the desktop chat window either.Whether the other person deletes or marks unread a conversation affects only the way it shows up on their device, not yours.