I have created a mailing list on igcomputers.co.za, called celrat. I have copied plain text e-mail addresses, one per line, to the mass subscription section a few times now but very few are receiving my invitation.

I'm "only" trying to invite about 200 people at once - is this the problem, too many?

I found a setting that limited the number of recipients of a message to the defaul of 10 and have changed this to 500 (surely this wouldnt apply to a mass subscription invitation??)