Clarifcation on Email Issues

[spnlloyd]

Hi Guys,

I am supporting and environment where they are currently using Cisco Iron Port (Email Security Appliance). The client recently implemented a core banking feature that generates a lot of outgoing mail and as a result they receive the following error on their exchange server:

421 #4.x.2 Too many messages for this session

I have reviewed iron port spam filter configurations and rate limits to ascertain whether the cause could be iron port but everything seems fine. Is there any other setting or configuration I should consider on iron port. Plus is a there a sizing document I can refer to specifying the rate at which different iron port appliances process email traffic.

The client is using exchange 2013.

[Libin Varghese · Accepted solution]

Hi,

In order to increase the number of messages allowed per session, please follow the instructions below.

1. Enter the Web GUI of the appliance
2. MAIL POLICIES -> MAIL FLOW POLICIES -> RELAY policy
3. Increase the 'Max. Messages Per Connection:' as per your requirement.
4. Submit.
5. Commit.

In order to review sizing opportunities I would recommend working with your Cisco sales rep as they have access to sizing tools that can take into account your current configuration. I do not think there is a sizing document available.

Thank You!
Libin Varghese

[spnlloyd]

Hi Libin,

Thank you for your response. Is there an effect on performance when I modify the 'Max.Messages Per Connection:' setting?

[Libin Varghese]

There could be, it would need to be monitored after the configuration is modified.

By increasing the number you are in effect allowing the server to inject a higher number of emails over a single connection with the ESA.

- Libin V