The reason this is occuring is because some spam filtering software is
screening E-Mail for the "Xlibrary:" header. This header is sent by
Indy 8.0 and the release versions of Indy 9.0. In and of itself,
this is not bad. However, some malware such as spam bulk E-Mails and
even a worm (W32/Nicehello@MM), were built with Indy meaning that they
sent the same "X-Library:" header that most Indy-based E-Mail programs
do.
For this reason, we have decided to remove the X-Library header from
Indy 9.0 code and you can obtain it from our VCS. Instructions are at:
http://www.indyproject.org/download/DevSnapshot.html
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