When sending mail to more than one customer the Send Mail feature times out, though a very few unknown number of customers receive the email. This occurred when I was on v1.5.0 and persists now that I'm on 1.5.4. I have ran Check Data base and no errors are exist. Suggestions would be appreciated. This was not the case back when I first installed ZenCart, but started when I got to around 600-800 customers. I now have around 3,000 customers and would like to communicate with them.