Joomla! 3.5.1 Not Sending Emails

People might encounter the error "Error: 0 - Invalid address:" when sending emails after upgrading to Joomla! 3.5.1 which affects all BreezingForms versions lower than Build 885 (full) and Build 913 (lite) and ContentBuilder lower than 0.9.91.

Since this update very likely affects other extensions, as well, I'll explain how to fix this quickly.

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