Sender header with wp_mail()
Read OriginalThe article details a problem where WordPress's wp_mail() function interferes with Postfix's sender_dependent_relayhost_maps configuration. It explores the underlying cause related to PHP's mail() function and the silent failure of the -f flag on some hosts. The author provides a technical solution using a phpmailer_init hook to properly set the Sender header and discusses security implications of default sender addresses.
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