imap_fetchbody can't handle mails sent with phpmailer? - php

Question

I am sending some emails with phpmailer with the regular example on their website.
the email is sent, and it arrives perfectly to the sent address.
after the mail is sent, I am saving the email to my sent items folder with imap_append, using the info of this answer Sent mails with phpmailer don't go to "Sent" IMAP folder
and in third place, I am creating a custom made webmail which reads my imap folders.
the problem is that I can't get the html body of the email sent correctly.
When I open the mail on sent items on thunderbird, or my phone, the body is shown perfectly.
but when I try to get the html body with php_imap functions I can't make it!!.
I created an isolated file to fetch the body of the msg like this:
$body = imap_fetchbody($conn,3392,1,FT_UID);
that returns this:
--b1_9db4e4310d1b141cbec79dd7de22f70b Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit á é í ñ Ñ REMOVED CONTENT --------------------- klfasjdkl adj skldj klfdj akfdsj lkfdasjfkl dasjf --b1_9db4e4310d1b141cbec79dd7de22f70b Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit á é í ñ Ñ
REMOVED CONTENT
---------------------
klfasjdkl adj skldj klfdj akfdsj lkfdasjfkl dasjf --b1_9db4e4310d1b141cbec79dd7de22f70b--
If I try
$body = imap_fetchbody($conn,3392,1.2,FT_UID);
don't get anything
If I try
$body = imap_fetchbody($conn,3392,2,FT_UID);
don't get anything, it seems that PHPMailer creating the emailbody in a way that imap_fetchbody can't handle?
thank you