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Why use Send/Receive groups? - Outlook - Office.com
Send/Receive groups enable greater control over each email account and enables you to specify how often to check for new messages.
Be notified when others receive or open an email message - Outlook - Office.com
Receive notifications in your Outlook inbox when messages you send are delivered or opened.
Get help when messages won't send - Outlook - Office.com
If you can't send email, read this article.
Automatically reply to email messages without using an Exchange Server account - Outlook - Office.com
Without an Exchange Server account, use rules and an email template with POP3 and IMAP accounts in Outlook to inform people you're out of the office.
Delay or schedule sending email messages - Outlook - Office.com
Compose a message now, but schedule it to be sent later.