📌 What Is Exchange Throttling?
Exchange throttling is a set of limits defined by Microsoft Exchange to prevent users or applications from overusing system resources. These policies control how often an account can make requests to Exchange Web Services (EWS) and how much data can be retrieved within a certain period.
While helpful for protecting your email environment, these limits can impact SigParser's ability to process mailboxes efficiently, especially for large mailboxes or high-frequency processing.
🔍 How Throttling Affects SigParser
When SigParser connects to your Exchange mailbox via EWS (Exchange Web Services), throttling policies may result in:
Slower processing speeds
Timeouts or connection interruptions
Throttling errors logged in Exchange or visible in the SigParser event logs
Incomplete scans for large inboxes
In some cases, you may notice that SigParser is not updating contact data as quickly or consistently due to these server-side limits.
🛠️ Recommended Solution: Adjusting Exchange Throttling Policies
To maintain stable processing performance, SigParser relies on consistent access to Exchange mailboxes via Exchange Web Services (EWS).
If you’re experiencing delays, connection issues, or throttling errors, your Exchange environment may need throttling policy adjustments—especially for the mailbox account used by SigParser.
General Guidance
IT administrators can address these issues by adjusting the EWS throttling limits for the mailbox account that SigParser connects through OR adjusting the limits for a particular mailbox that is experiencing issues. This may involve increasing limits such as:
EWSMaxConcurrency: Number of concurrent connections allowed
EWSMaxBurst: Number of operations allowed in a short time
EWSRechargeRate: Rate at which the burst budget is replenished
EWSCutoffBalance: Total allowable balance before blocking requests
Increasing or removing these limits can help reduce interruptions during large-scale mailbox scans or initial syncs.
For On-Prem Exchange (OPE)
If you're using Exchange On-Premises, you can configure a custom throttling policy and assign it to the SigParser mailbox account using PowerShell. This allows you to bypass default throttling settings that may interfere with mailbox processing.
By setting a custom policy to increase (or remove) throttling limits, especially for the service account used by SigParser, processing can resume more reliably—particularly when large volumes of data are being scanned.
🔗 Additional Microsoft Resources
For full documentation on EWS throttling in Exchange, refer to Microsoft’s official guide:
If you have any questions, send us an email at support@sigparser.com. You can also book a demo session HERE.