Is there something wrong with the email module? I'm using email.send to send maybe twenty emails to myself (hard-coded). Eleven of them went through. Then I tried three and none went though. No execution errors, the script is not being halted. My logs make it seem like they're all being sent. Nothing is showing up in Barracuda and I'm not receiving any emails.

have you followed the steps outlined in Troubleshoot Undelivered Email

Oh ok. I'm getting Not Sent: Blocked by Mail Filter. It must be Barracuda.

Normally, that issue in there is more of the body + subject being the same thing for a rapid rate

Check spam too. We are still struggling with emails sent out of NetSuite ending up in people's spam box for no reason.

I don't get it. I thought I found emails in the undelivered emails list, but they were actually older. Nothing in Barracuda, and the body is dynamic. Is it really just the same subject being emailed from NetSuite that is breaking the process? This seems like a huge issue with the API.

I found that barracuda did the same for me. We switched over to Sophos and do not have that issue any longer.