Well in my experience you really need to find out exactly what the issue is. If the members in your club are marking this as spam then that is how it should work because they should have control and if they did mark them as spam then you either live with it or you send them an internal email on your site and tell them to mark it as safe.
I actually have that in my TOS that they must accept my emails from my social site.
Now if that is not the issue then you need to check with your ISP and make sure they are not blocking them.
If that is not the issue and it is the email clients such as yahoo and hotmail and the like, then i suggest you contact them as there is a reason.
Quite a long time ago and i dont even know if they still do this as msn and hotmail has made so many changes in what they do and what they dont anymore (they seem to be hacking their freatures to death streamlining their services), hotmail and msn used to have a support section or email that you could submit your siteemail to in order to be preapproved as not spam. Once they determine that you did not have malicious motives then you were approved and at least until someone marked you as spam you were good to go. But as i said i do not even know if that is still the case or not.
here is the info on SMTP
Basically you should be able to set up your site email to use SMTP in your Cpanel at last i remember (im not 100 percent on that). I usually do it thru my scripts but yours might not have that feature.
The bottom line is you need to make sure you know exactly what is happening to your email before you decide on how to fix it. Talk to your members if it is only 200 it should be easy enough to find out.
ps.. however i would stay away from email services that promise to take care of your email needs, this is just my opinion (IMO) however. IMO you are much better off handling your own affairs.
Hope this helps.