If you are having problems sending and receiving mail, you may need change your authentication method or send and receive ports.
In Outlook 2016 and newer with the new simplified accounts dialog, go into Send & Receive settings to view More Settings.
You can access this dialog using the Ctrl+Alt+S shortcut or from File, Options, Advanced, Send/Receive button or the Send/Receive menu, Send/Receive Groups, Define Send/Receive Groups. After opening the Send/Receive dialog, Edit, select the account then click Account Properties.
- Click on File, Account settings in Outlook 2010 and 2013 (and some older builds of Outlook 2016) or Tools, Account settings in Outlook 2007. See below for the menu path in older versions of Outlook
- Select the account and click Change to open the account settings dialog (or double click on the account).
- Click More Settings.
- On the Outgoing server tab, select the authentication method used by your SMTP server. Most will use the same as the Incoming server. If you use a server that is associated with a different account, enter the correct username and password on this tab.
- Change the port numbers and encryption method on the Advanced tab as needed.
Note: The screenshot above is the More Settings dialog for an IMAP account in Outlook 2013. The options available vary for POP3 accounts and in older versions of Outlook.