Double click on the account and click More Settings, then select the Advanced tab. In Outlook 2003 and older, go to Tools, E-mail accounts, View or Change existing accounts. Many email providers use port 587 for SMTP.
If you aren't sure, enabling authentication before sending usually doesn't cause problems, but you should verify the proper settings with your email provider. Many email providers now require a password to send email. Check your settings on the Outgoing server tab.Double click on the account then click More Settings.Go to Tools menu (Outlook 2007) or File tab (Outlook 2010) then Account Settings, Email.Verify your password works by logging into your account using web access. Wrong or bad password, or not authenticating properly with the mail server See Outlook: After viewing the Outbox, e-mail won't send for applications that cause messages in the Outbox to be marked as read. Symptom: you look at the mail in the Outbox and it's not bolded. (If you need the text of the error code, you can select any error and use Ctrl+C to copy it.)Īn add-in marks items read if you view the Outbox See What does this error mean? for the reasons for some of the error codes. The error will resemble this, with a different error number and possibly a better explanation than "unknown error" Browse to Tools, Send/Receive, Send/Receive settings, Show progress and click on the error tab. An antispam or antivirus scanner is scanning outgoing mailįirst, check the Send/Receive progress dialog for error codes.Using a program that accesses pst or ost data, such as Desktop Search, Lync, etc.Wrong password or not authenticating properly with the mail server.An add-in that marks items read if you view the Outbox.If the message is not too large to send, other possible causes include:
It's most likely a read receipt that won't send.
If you don't see a message in your outbox but Outlook is trying to send something, see Hidden Stuck Messages. If you are using a Comcast account and messages aren't sending, you need to change your outgoing server to use port 587 or 465 and set Use this following type of encrypted connection to None then click OK.
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