Possible command issue with multiple commands at (almost) same time

I have a situation where I am firing off two triggers within a single loop. In this case it is trigger an email to be sent and the loop is through a list of email addresses to send the email to.

The problem is, only first email is being sent because only the first trigger is recognised. I'm not sure if this is a transmission problem on the client, or a receive problem on the server, however the server seems to receive multiple packets at the same time in other situations without a problem.

This is critical, but my current test case was able to work around this issue by putting in a small sleep(1) after sending each trigger.