Some Unix mail transfer agents (most notablyĪutomatically (which leads to doubling CR if CRLF is used). If messages are not received, try using a LF (\n) only. Return-Path when sending directly via SMTP (Windows only). Set in php.ini or custom "From:" header missing. Message similar to Warning: mail(): "sendmail_from" not Never start mail body by puttingĪdditional_headers parameter, or a defaultįailing to do this will result in an error Therefore, users must make sure specified headersĪre safe and contains headers only.
If an array is passed, its keys are the header names and itsīefore PHP 5.4.42 and 5.5.27, repectively, additional_headers did not have mail header So that no unwanted headers could be injected. If outside data are used to compose this header, the data should be sanitized
Multiple extra headers should be separated with a CRLF (\r\n). This is typically used to add extra headers (From, Cc, and Bcc).
String or array to be inserted at the end of the email header.
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