As an afterthought, since you already fixed it. Here's a peice of advice that may or may not work for you. I am currently working with SMTP for work with a postfix mta system.
you may want to consider using threads and Thread::Queue. then you queue up your messages, create a pre-defined number of threads and just have them pull from the queue then join when they are done. Very fast very efficient.
in reply to Re^4: Just can sent only ONE mail every time.
in thread Just can sent only ONE mail every time.
"One future, two choices. Oppose them or let them destroy us" - Propaghandi