Sending a mass email to your members can be a complex endeavour. It is easy to overlook the multitude of different parties that operate between the sending and receiving processes. Every party has their own terms & conditions and spam filters. As such, there is always the probability of emails sent from Congressus Manager to end up in your members' spam folders.
Authenticating your emails
Luckily there are a measures you can take to prevent your mailings from being marked as spam.
We can help you with the first two points, read the articles for more information. Making sure your emails are seen as qualitative is more difficult. A rule of thumb: would I like to receive emails like this from other parties?