cryptic mail body when using imap_fetchbody - php

Question

I am using following code to exctract among others the mail body of mails.
$imap = imap_open($mailbox,$user,$password);
$mails = imap_search($imap,'UNSEEN');
foreach($mails as $mail)
{
$message = trim(utf8_encode(quoted_printable_decode(imap_fetchbody($imap,$mail,"1"))));
if(strpos($message,"<html") !== false)
{
$mail_body = fopen($dir."mail.html","w");
}
else
{
$mail_body = fopen($dir."mail.txt","w");
}
}
This is working fine and it works with every test I did.
html-mails, plain-text-mails, also if the mails are forwarded.
Now from some other source I get mails, where the message (after using imap_fetchbody) just looks like some crypted string. Like this:
dGVpZW4gaW0gUERGLUZvcm1hdDoNClJla2xhbWF0aW9uc2luZm9ybWF0aW9uOiAyMTMzNjc0MSBS
SV8yMTMzNjc0MS5wZGYNCg0KTWl0IGZyZXVuZGxpY2hlbiBHcsO8w59lbg0KSWhyIG5vYmlsaWEg
VGVhbQ0KX19fDQoNCm5vYmlsaWEtV2Vya2UgSi4gU3RpY2tsaW5nIEdtYkggJiBDby4gS0cgfCBX
YWxkc3RyLiA1My01NyB8IDMzNDE1IFZlcmwNCg0KRGllIEdlc2VsbHNjaGFmdCBpc3QgZWluZSBL
I already tried to use some other arguments for imap_fetchbody like "1.1" or "1.2", but when I do that the message is empty.
Do you have any idea why this effect occurs?

Answer 1

I finally found a solution. The cause seems to be forwarded mails, that were initially sent from an apple device.
Now I use this to extract the message and it works.
$structure = imap_fetchstructure($imap, $mail);
$part = $structure->parts[1];
$message = imap_fetchbody($imap,$mail,1);
if(strpos($message,"<html") !== false)
{
$message = trim(utf8_encode(quoted_printable_decode($message)));
}
else if($part->encoding == 3)
{
$message = imap_base64($message);
}
else if($part->encoding == 2)
{
$message = imap_binary($message);
}
else if($part->encoding == 1)
{
$message = imap_8bit($message);
}
else
{
$message = trim(utf8_encode(quoted_printable_decode(imap_qprint($message))));
}