Weird E-Mail parsing error with Paypal Donation Mail - php

Question

I want to automatically process E-Mails which I get from Paypal for donations to my E-Mail-Adress. (via cronjob and php script)
So far, so good. I made a test donation and for further testing, I copy this mail with Outlook to INBOX several times.
Everything worked fine with the copied Mail (I'm checking a String in E-Mail Body)
but now I've made another test donation and it wasn't working.
It turned out that the E-Mail-Body is not parsed correctly.
I've tried already with Ararat Synapse in Delphi but same result.
The correct E-Mail Body from copied Mail looks like this:
Guten Tag Peter Meier ! Diese E-Mail bestätigt den Erhalt einer Spende über €1,50 EUR von Peter Meier (peter.meier#gmx.de ). Sie können die Transaktionsdetails online abrufen . Spendendetails Gesamtbetrag: €1,50 EUR
But the original Mail from Paypal is parsed as
PGh0bWwgPgogICA8aGVhZD4KICAgCQk8bWV0YSBodHRwLWVxdWl2PSJDb250ZW50LVR5cGUi IGNvbnRlbnQ9InRleHQvaHRtbDsgY2hhcnNldD1VVEYtOCI+CiAgIAkJPG1ldGEgbmFtZT0i dmlld3BvcnQiIGNvbnRlbnQ9ImluaXRpYWwtc2NhbGU9MS4wLG1pbmltdW0tc2NhbGU9MS4w LG1heGltdW0tc2NhbGU9MS4wLHdpZHRoPWRldmljZS13aWR0aCxoZWlnaHQ9ZGV2aWNlLWhl aWdodCx0YXJnZXQtZGVuc2l0eWRwaT1kZXZpY2UtZHBpLHVzZX...
And so on, copiedmail.html is 3KB, original is 28KB.
My Code:
$connection = imap_open("{imap.gmx.net:993/imap/ssl}", "peter.meier#gmx.de", "password"); //connect
$count = imap_num_msg($connection); //get E-Mail count in INBOX
for($msgno = 1; $msgno <= $count; $msgno++) //walk through INBOX mails
{
$headers = imap_headerinfo($connection, $msgno); //read E-Mail header
$subject = $headers->subject; //read subject
//decode subject
$elements = imap_mime_header_decode($subject);
$decodedsubject="";
for ($i=0; $i<count($elements); $i++)
{
$decodedsubject = $decodedsubject.$elements[$i]->text;
}
$body = imap_fetchbody ($connection, $msgno, 1); //read body
echo $body; <--- Here I get long cryptic Text in original Mail
}

Answer 1

Thanks to NineBerry,
I found out that paypal uses base64 encoding for their mails.
So the body was parsed correctly by this code
$body = imap_fetchbody ($connection, $msgno, 1); //read E-Mail-Body
$body = imap_base64($body);
echo $body;
To check encoding as suggested, you could do:
$structure = imap_fetchstructure($connection, $msgno);
$encoding = $structure->encoding;
$body = imap_fetchbody ($connection, $msgno, 1);
$body=decodebody($encoding, $body);
echo $body;
function decodebody($encoding, $body)
{
switch ($encoding)
{
# 7BIT
case ENC7BIT:
echo "7BIT<br>";//
return $body;
break;
# 8BIT
case ENC8BIT:
echo "8BIT<br>";//
return quoted_printable_decode(imap_8bit($body));
break;
# BINARY
case ENCBINARY:
echo "BINARY<br>";//
return imap_binary($body);
break;
# BASE64
case ENCBASE64:
echo "BASE64<br>";//
return imap_base64($body);
break;
# QUOTED-PRINTABLE
case ENCQUOTEDPRINTABLE:
echo "QUOTED<br>";//
return quoted_printable_decode($body);
break;
# OTHER
case ENCOTHER:
echo "OTHER<br>";//
return $body;
break;
# UNKNOWN
default:
echo "UNKNOWN<br>";//
return $body;
break;
}
}
Of course echo in function is only for you to check.
BTW, I pasted the snippet from my Original Question to this online decoder:
https://www.base64decode.org and it also worked :)