Well, the exchange admin, dispite other email working, went and bumped space, and it is working for now. Doesn't answer the question on why it had been working for years, as it was, then decided no Bueno. There hadn't been any changed to either exchange or listserv. No changes in the types of messages going out. So, who knows.
-----Original Message-----
From: LISTSERV Site Administrators' Forum <[log in to unmask]> On Behalf Of Ben Parker
Sent: Friday, September 16, 2022 1:41 AM
To: [log in to unmask]
Subject: Re: listserv error
On Thu, 15 Sep 2022 18:36:59 +0000, Jon Schwendemann <[log in to unmask]>
wrote:
>Insufficient system resources (UsedDiskSpace[C:\Program
>Files\Microsoft\Exchange Server\V15\TransportRoles\data\Queue])
This error screams insufficient disk space. If the error occurs in the LISTSERV Log file, then look just before this to see what list is being mailed to and how many recipients there are. The message size will not be noted but the LISTNAME and # of recipients will be. If the list has Archives, you can determine the message size from that.
If the list is largish (1,000 rcpts) and assume the message is 10K in size, the exchange server suddenly needs 10MB of disk space to handle the transient load. If the message is larger and even if #rcpts is smaller Exchange still needs gobs of disk space, but only for a short time.
Reducing MAXBSMTP may be helpful here, but first you need to understand the size of instantaneous traffic needed for your list(s) (#rcpts) and average message size. That error message says Exchange doesn't have enough disk space to handle the load. I dunno what space is available but clearly Exchange thinks it doesn't have enough. You either need more space (never a bad idea) or make the load from LISTSERV into more, but smaller chunks that Exchange can handle (reducing MAXBSMTP).
Take your largest list #rcpts and your largest message (from any list), multiply that and then multiply that answer X3. that's how much free disk space you need in the mailer queue (Exchange in this case) to handle surprise large mailings through LISTSERV along with other traffic.
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