Start/notes.ini Parameters/RouterAllowConcurrentXFERToAll

RouterAllowConcurrentXFERToAll

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Parameter: RouterAllowConcurrentXFERToAll
Short description: Allows the router to perform concurrent mail transfers to all external domains – not just explicitly configured hosts.

Profile

Parameter
RouterAllowConcurrentXFERToAll
Category
Mail / Router
Component
Server
Available since
9.0
Supported versions
9.0.1, 10.0, 11.0, 12.0, 14.0, 14.5, 14.5.1
GUI equivalent
notes.ini only (no GUI)
Possible values
0 = only for configured hosts (default), 1 = concurrent transfers to all domains

Description

By default, the Domino router allows parallel outbound transfers only to hosts for which this is explicitly enabled in the configuration document. With strongly divergent mail load (many recipient domains, no clear smarthost), this can limit throughput – mails pile up in mail.box. With RouterAllowConcurrentXFERToAll=1, the router may open parallel threads per external domain, which significantly increases outbound throughput.

Example configuration

RouterAllowConcurrentXFERToAll=1

Notes & pitfalls

  • Increases resource usage (threads, sockets) – keep an eye on OS limits and NOTES_MAX_FILEHANDLES.
  • Takes effect after a router restart (tell router quit / load router).
  • Use RouterMaxConcurrentTransfer to sensibly cap the upper limit per target, otherwise a single recipient mail server may be overwhelmed.
  • In the failure pattern “mails pile up even though bandwidth is free,” this is a classic first tuning switch.