The system was 2.1.0. I have since updated it to the most recent version and build on their monthly schedule.
As for add-ons I am told they used the built in functions. Firemail is installed…...
It is setup to use php mail right now.
They email was sent to 839 emails. An batch mode was used splitting into groups of 200.
they send out a newsletter every week to 211 people with no one reporting any issues.
If this is a batching issue how can we test this to make sure it does not happen with out sending it to the 800+ people?