If you experience trouble sending mail, it is likely that your ISP is blocking the default Port 25; this is a very common process that’s designed to protect the service from spammers. To fix this problem, follow these steps:
1. Select Tools / Accounts.
2. Select your email account from the list in the dialog box, and choose Properties to bring up the settings window.
3. Click on the Advanced tab.
4. In the text field labeled Outgoing mail (SMTP), replace the port number with 587.
5. Click Apply to store your settings and then OK to close the dialog box.
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