Hi all, i've made further researches:The problem happens with both pop3/imap fecthing but only with lotus notes/domino mailing system.I've seen that mail format is like:This is a multipart message in MIME format.
--=_related 003B5076C1257C72_=
Content-Type: multipart/alternative; boundary="=_alternative 003B5076C1257C72_="
--=_alternative 003B5076C1257C72_=
Content-Type: text/plain; charset="US-ASCII"
some texh here
--=_alternative 003B5076C1257C72_=
Content-Type: text/html; charset="US-ASCII"
<img src=cid style="border solid;">
<br><font size=2 face="sans-serif">some text</font>
<br><font size=2 face="sans-serif">some text</font>
<br><font size=2 face="sans-serif">some text</font>
<br>
--=_alternative 003B5076C1257C72_=--
--=_related 003B5076C1257C72_=
Content-Type: image/png
Content-ID: <_4_0BEFFDB80BEFD3D0003B5076C1257C72>
Content-Transfer-Encoding: base64
Gmail opens and displays correctly this mail, and thunderbird can fect it clearly either through POP or IMAPbyestefano