Doc: Proper setting of tcp_recv_buffer_size for inbound ESMTP conn … - #870
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…parkPost/Momentum#1593) Signed-off-by: Doug Koerich <douglas.koerich@bird.com>
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deepakpn
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…(SparkPost/Momentum#1593)
Note
Low Risk
Documentation-only changes with no runtime or configuration behavior modifications.
Overview
Adds Momentum 4 documentation for inbound
tcp_recv_buffer_size, including a new reference page and ESMTP listener guidance for high-latency paths.Introduces
ref-tcp-recv-buffer-size.md(defaults,SO_RCVBUF,0for OS autotuning, bandwidth–delay product sizing, Linux sysctl caps, listener scopes) and links it from the configuration options summary.tcp_buffer_sizeis clarified as outbound-only, with inbound receive buffers pointed to the new option.esmtp-listener.mdgains “Receive Buffers on High-Latency Links”: how a small default window can throttle WAN reception and contribute to sender-side timeouts/duplicate delivery, plus example configs usingTCP_Recv_Buffer_Size = 0or an explicit BDP-sized value.Reviewed by Cursor Bugbot for commit 73fd5c7. Bugbot is set up for automated code reviews on this repo. Configure here.