Or even better:
WP No External Links
that will mask all your external links on the fly:
Code:
Masking links with digital short codes
Better WordPress External Links
you can blank or spoof your page referral
Allows you to prefix external links with anything (typical use could be a redirection page that warns your visitors about the danger of visiting external sites). Typically, you may use something like this: http://example.com/out.php?url=external_url, which means you prefix the external links with another URL of your choice. If you post download links in your posts you might also want to anonymize it using some 3rd-party services such as http://anonym.to, which is already available by default.
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