mail() silly question

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I have a question that might be too silly for those of you who are PHP gurus.

Here it comes:

I had a mail (specifically in the headers) function call like this:

$header = "";
$header .= 'From: info@xxxxxxxxxxxxxxxxxxxx\r\n";
$header .= 'MIME-Version: 1.0\r\n";
$header .= 'Content-type: text/html; charset=iso-8859-1\r\n";
$header .= "Reply-To: ".utf8_decode($nombreVar)." ".utf8_decode($apellidosVar)."<$mailVar>\r\n";
$header .= "X-Mailer: PHP/".phpversion()."\r\n";
$header .= "X-Priority: 1";

and the mail(...) function always returned TRUE, but the mail was NOT sent.

After hours of... trial/error debugging, I noticed from an example that it should be:

$header = "";
$header .= 'From: info@xxxxxxxxxxxxxxxxxxxx' . "\r\n";
$header .= 'MIME-Version: 1.0' . "\r\n";
$header .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$header .= "Reply-To: ".utf8_decode($nombreVar)." ".utf8_decode($apellidosVar)."<$mailVar>\r\n";
$header .= "X-Mailer: PHP/".phpversion()."\r\n";
$header .= "X-Priority: 1";

Question:

Why? What's the real difference between
   $header .= 'From: info@xxxxxxxxxxxxxxxxxxxx' . "\r\n";
and
   $header .= 'From: info@xxxxxxxxxxxxxxxxxxxx\r\n";

?
If somebody knows, please let me know!

Thank you in advance.

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