Alain, my problem was not to send an email, but was my server hanging up. I 
thought Mandrill was blocking your server to process new requests.

On Friday, August 7, 2015 at 12:51:17 PM UTC-3, Moacir Braga wrote:
>
> It’s been a few weeks since I started trying to solve this problem, but I 
> still haven’t figured out a possible solution. The issue is that my server 
> accepts requests and responds to them normally in the beginning. However, 
> after an unknown event happens (I’m still trying to discover which event it 
> is), the server continues accepting requests, but it stops responding to 
> them.
>
>  
>
> I’ve already checked the Process Monitor (the server is running on Windows 
> Server 2012 R2) and I could notice that when this problem happens, new 
> requests generate a TCP Accept, a TCP Receive, but not a TCP Send nor a 
> Disconnect.
>
>  
>
> I tried to execute the server in debug mode, but then again, when this 
> problem happens the debugger does not work and it hangs up as well.
>
>  
>
> The server doesn’t explode and no errors occur. Thus, domains won’t help 
> me in this case. I’ve tried to handle uncaughtException, but it also didn’t 
> work.
>
>  
>
> The server keeps running without using excessive processor or memory 
> resources. Its behavior is still similar to the one during the first 
> execution, except for the fact that it’s not responding as it was before.
>
>  
>
> When I sent a SIGNAL via console, the server simply started working 
> normally again without restarting or anything. It just got back to normal.
>
>  
>
> I tried to execute a lot of requests using ApacheBench and NeoLoad, but I 
> just can’t reproduce this problem. It simply happens randomly.
>
>  
>
> The socket has a timeout of two minutes. However, the server keeps hanging 
> up the requests for hours.
>
>  
>
> When I sent the SIGNAL mentioned before, all requests that were hanging 
> were executed, as if they were in a queue waiting for the last request to 
> be finished.
>
>  
>
> I don’t know what else could I do to find out what is causing this problem.
>
>
> I'm using Node.js + Express + body-parser + cookie-parser + Windows 
> Server 2012 R2 x64 with GUI + Amazon EC2 micro instance.
>
>
> *If somebody has any idea of what is causing the server to hang up 
> forever, please tell me.*
>
>
> Best Regards,
>
> *Moacir Braga*
>

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