I've got an Exchange server 2003 Version 6.5 (Build 7638.2 : Service Pack 2) installed on a Windows Server Std 2003 SP2, with GFI MailEssentials 12.0 and GFI MailSecurity 10.0.
My SMTP connector is configured for a single external Smart Host only.
I'm having the issue that mail is queing in the 'messages pending submission' queue, and I get an intermittent SMTP protocal event sink error on the SMTP connector queue, which status turns to Retry and then to Active after several minutes. The queue takes up to 3 hours to return to normal for about 1500 very small emails.
My major concerns are the following:
1. My users send out hundreds of statements each about 10kb-20kb big, I'm thinking that our external SMTP host sees this as abusive and bans us for a couple of hours. Is there a way of using DNS and MX records instead of relying on just this one SMTP Relay server for sending mail or maybe a way around this issue? If I put it on DNS a lot of the mail returns server not found.
2. Viewing the traffic on my ISA server i can see that outgoing mail are being sent in bursts with long times of silence, maybe a indication of a performance issue on my Exchange box?
3. Running ExBPA (Exchange Best Practise Analyzer Tool, awesome tool for finding issues) I find that having the store on the same drive is a performance issue, but my drive is RAID 5 with 4 SATA drives, would two partitions help, or does it have to be separate physical drives?