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When I used a header, like the one below, for my Php Mail Function, it worked with all mail accounts like gmail, hotmail etc, but not with Microsoft Outlook.
Theses Headers were the ones given in Php Manual. But After removing the '\r' from the header, It works well with all mails including Microsoft Outlook
Note: If messages are not received, try using a LF (\n) only. Some poor quality Unix mail transfer agents replace LF by CRLF automatically (which leads to doubling CR if CRLF is used). This should be a last resort, as it does not comply with » RFC 2822.