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"Too many connections" appears in InterScan Messaging Security Virtual Appliance (IMSVA)

    • Updated:
    • 4 May 2017
    • Product/Version:
    • InterScan Messaging Security Virtual Appliance 8.2
    • InterScan Messaging Security Virtual Appliance 8.5
    • InterScan Messaging Security Virtual Appliance 9.0
    • Platform:
    • N/A N/A
Summary

Some providers, such as Orange, Wanadoo, and Oléane, limit the number of simultaneous connections into their servers to prevent transformation of any random machine to a spambot. Thus, you cannot send mails. The emails are queued in IMSVA and the following error message shows:

Host <Service Provider's MTA> refused to talk to me: 421 .... Too many connections, slow down.

Details
Public

As a result, only authorized providers (Orange, Free.fr, 9Tel, and other main foreign providers) can send more than the limit.

To avoid this limitation, use the mail server from your provider as a relay/smarthost for the domains:

  1. Navigate to Administration > IMSVA configuration > SMTP Routing > Domain-based Delivery.
  2. Add the following:
    • Destination domain
    • Mail server of your provider (FQDN or IP)
    • Related port, which is normally port 25
Premium
Internal
Rating:
Category:
Configure; Troubleshoot
Solution Id:
1101598
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