For some days, I have regularly this message when I open my emails from my network:
This worries me because it means that my members will not recieve the messages of my network.
What can I do? Does this mean that Ning is blacklisted? Does this mean that I sent too many messages to my members? (one each day for a video)
Any help or advice is welcome.

Hi Ambroise,
I have seen periods of time where Ning emails tend to be sent to the spam box, more than other times. I haven't noticed receiving any in my spam box for some time now.
Just to ease your mind, your site is not blacklisted. Your broadcast messages probably contain words that are triggering the spam filter of your gmail account, and possibly other email host accounts. The auto-filter for spam is picking up something in the broadcast messages, and/or the email notifications that send them to the spam box. For your email account, looks like all you need to do is "Edit Filters".
For your members and your network notifications at large - - Gmail has very aggressive default spam filtering. But this doesn't mean that all of your members will experience the same. It depends on whether or not they use gmail, and their filter settings.
It wouldn't hurt to visit your Ning Network Details. Take a close look at your network name and tagline. Make sure there's nothing within that text that might be flagged as spam. In regards to your broadcast messages, check carefully for any words that may trigger spam filters. Here's a good article on words not to use when writing a newsletter. It's an old list, but some real good examples of words and phrases that may trigger spam filters:
http://blog.sendblaster.com/2009/10/19/200-spam-words-and-phrases-t...
Hope that helps,
Jen
Just to confirm, my message broadcast on Monday was tagged as Spam (not by gmail but by one.com). I have reported it to Ning but so far no response. Nothing in the broadcast contained any words that should trigger the Spam filter so this does need to be looked into urgently.

I have seen this happen too, and never really understood what was happening. I was hoping it was something triggering the spam filters. Sorry to hear it.
Best Regards,
Jen
Thank you Jen for this word list to avoid. I have found several of that words in my emails.
I recently added to my emails "You are receiving this message because you are member of network_name". I also have several "click here" in my emails.
I rephrase these sentences to avoid these words. Thank for your advice.
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