["bbbluedefense@xxxxxxxxx" <bbbluedefense@xxxxxxxxx>]

Hi, I've some problem to send medium (about 2 o 3 pages of html) emails 
to  the smtp server of gmail and now the same problem to post a message 
to a forum. So I sniffed my traffic and I found the following error:
[This frame is a (suspected) retrasmission]
What's means ?
thx
bdefense.