HI,
Yes I had that problem as well I strongly recomend using Firetank software "Newsletter sender and Newslist Control Add on" - I have been using this add on for a few years and I am blown away with the excellent service I have received from them.
The current module as it stands does not limit how many newsletter are send per hour. So when my hosting company presented me with this problem I wrote to Firetank support desk and with in 24hours they emailed me a modification that allowed the mail program to send just 500 emails an hour (my mailing list is close to 4000) - I mail out every 2 weeks and I have never had a problem with the program. The modification was FREE.
Yesterday I emailed them to say that I needed an unsubscribe link on every newsletter as my hosting company thought my emails where spam. Within 24 hours I received an email detailing how to do this (as the feature is part of the original add on)
So looking for a Newsletter add-on I cannot strongly recommend FIRETANK enough
As they have never charged me for all the help they have given me I feel the only way I can pay them back is a huge shout out how great they are.
Judith
www.beadsonline.com.au