Severe spam problem
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See my review. This plugin has been abused to send spam email. I’m sorry to say it is very badly written, and does not validate the TellAFriend_message or TellAFriend_Link parameters, which can be used to insert any content in an email to any recipient.
According to the changelog, from version 5.3 a CAPTCHA was removed and “form accept submission only from your website domain” – referrers are forged by bots, so this is no protection against abuse at all!
No copy is sent to the site owner by default.
I don’t think this is ever likely to be a workable approach to sending mail to an arbitrary address, even with a CAPTCHA. Better solutions for this are: (a) don’t allow the visitor to modify the subject line or content at all; or (b) create a mailto: link so the visitor can edit related text but send through their normal email system.
https://www.ads-software.com/plugins/wp-tell-a-friend-popup-form/
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