Hi @Legoktm and Wctaiwan: what is the maximum amount of MassMessages that can be sent at once?
Topic on Extension talk:MassMessage
It's been a while since I looked through the code, but I did just now and didn't immediately see a limit. There are some practical limits, if you want to send bigger deliveries there are better options depending on what you're doing though.
Thanks a lot, Legoktm!