Message to gmane newsgroup comes back with Mail Delivery Failed marked as spam

I signed up for the mailing list for MySql++ developers. I noticed that 
this mailing list was mirrored by a Gmane group, 
gmane.comp.db.mysqk.c++. I attempted to send a message to this Gmane 
group and got back the authorization required message. I replied and 
received the "You are now authorized to post to the
gmane.comp.db.mysql.c++ newsgroup" message.

When I try to post to this group I always receive a Mail Delivery failed 
message with:

  plusplus <at> lists.mysql.com
     SMTP error from remote mailer after end of data:
     host lists.mysql.com [213.136.52.31]: 552 spam score exceeded 
threshold (#5.6.1)

My message contains no spam and I reprint it here:

Subject:
Inserting rows with SSQLS and auto-increment columns

Body:
When creating an SSQLS for inserting a row of data, where the first data
element of the SSQLS structure is an auto-increment column, how do I
specify that element's type in the SSQLS structure and to what do I set
that element before calling query.insert for my data ?