Contents

Introduction

How many messages can the ESA/SMA retain in its mail queue?

Related Information

Introduction

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:

Appliance

Model

Mail Queue

Max Messages

ESA

C170/C190/C195

10GB

690,000

C370/C380/C390/C395

35GB

2,440,000

C670/C680/C690/C695

70GB

4,890,000

X1070

70GB

4,890,000

ESAv

C100V

10GB

690,000

C300V

70GB

4,890,000

C600V

70GB

4,890,000

SMA

M190/195 & M380

10GB

690,000

M390/395 & M670/M680

20GB

1,390,000

M690/695 & M1070

30GB

2,090,000

SMAv

M100V

10GB

690,000

M300V

20GB

1,390,000

M600V

30GB

2,090,000

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:

myesa.local> ipcheck

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

PS1 Unknown

PS2 Unknown

Key 310day, Data Loss Prevention

Key 310day, External Threat Feeds

Key 310day, File Analysis

Key 310day, File Reputation

Key 310day, Graymail Safe Unsubscription

Key 310day, Intelligent Multi-Scan

Key 310day, IronPort Anti-Spam

Key 310day, IronPort Email Encryption

Key 310day, IronPort Image Analysis

Key 310day, McAfee

Key 310day, Outbreak Filters

Key 310day, Sophos

Key 31365day, Bounce Verification

Key 31365day, Cloud Administration

Key 31367day, Incoming Mail Handling

Note: You will need to adjust the theoretical numbers based on your average message size and mail flow for your environment.

Please see the Cisco Security > Cisco Email Security Product Support page for current hardware models and further information regarding each specific model.

Related Information

- Cisco Email Security Appliance Data Sheet

- x95 Security (ESA, WSA and SMA) Solution Overview

- Cisco Products and Services > Security > Cisco Email Security

- End-of-Sale and End-of-Life Announcement for the Cisco x170 and x80 Email, Web, and Content Security Management Accessories

- End-of-Sale and End-of-Life Announcement for the Cisco Email, Web and Security Management x90 Hardware Appliances

- Technical Support & Documentation - Cisco Systems