I found that a bit strange myself, but we log all traffic flows through the 
firewall and the only communication going on was on port 993.

-----Original Message-----
From: Andrew Miehs [mailto:[email protected]] 
Sent: April-23-13 7:40 PM
To: James S. Smith
Cc: [email protected]
Subject: Re: [j-nsp] SRX3600 weirdness

Sent from a mobile device

On 24/04/2013, at 6:56, "James S. Smith" <[email protected]> wrote:

> 
> 
> We have a database subnet outside the firewall, and an exchange server subnet 
> behind the firewall.  A database server uses IMAP4 over SSL (TCP 993) to send 
> emails to Exchange.  The connection open and closes pretty regularly, every 
> 5-15 minutes or so, and closes after the communication is done.

Are you sure it doesn't use smtp to send mails?

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