This document describes the mail queue size and an approximate number of messages that can be retained on the Email Security Appliance (ESA) or Security Management Appliance (SMA).
How many messages can the ESA/SMA retain in its mail queue?
Under certain circumstances, it might be necessary for the appliance to store messages for delivery at a later time. Based on an average message size of 15 KB (15,360 bytes), this table summarizes how many messages each model of the ESA and the SMA can retain and the corresponding mail queue size:
M190/195 & M380
M390/395 & M670/M680
M690/695 & M1070
In order to determine the exact mail queue size of your appliance, run the command ipcheck from the CLI on your appliance. The mail queue size is listed in the output.
Example output from a C600V:
Ipcheck Rev 1 Date Thu Nov 21 21:47:34 2019 Model C600V Platform vmware (VMware Virtual Platform) MGA Version Version: 13.0.0-314 Build Date 2019-09-21 Install Date 2019-10-14 17:40:45 Burn-in Date Unknown Serial No. 420DE3B51AB7aabbccdd-9F04aabbccdd BIOS Version 6.00 RAID Version NA RAID Status Unknown RAID Type NA RAID Chunk Unknown BMC Version NA
Disk 0 500GB VMware Virtual disk 2.0 at mpt0 bus 0 scbus2 target 0 lun 0 Disk Total 500GB
Root 4GB 6% Nextroot 4GB 6% Var 400MB 5% Log 400GB 7% DB 12GB 0% Swap 8GB Mail Queue 70GB
RAM Total 16384M
NIC Management 00:50:56:88:11:ee NIC Data 1 00:50:56:88:88:88 NIC Data 2 00:50:56:88:55:aa