I came across the [web] RemoteIPHeader setting today, I think that's what you're looking maybe. Set that (in your sbbs.ini file) to your X-Real-IP and you should get what you're looking for in the log messages, I think.
--- SBBSecho 3.37-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)
From Rob Swindell@1:103/705 to GitLab note in main/sbbs on Wednesday, February 11, 2026 23:25:25
For more info, see commit 7712fdfa3ed04e3c58dc4c73d154e0a8a8c5ec0d
--- SBBSecho 3.37-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)
From Fernando Toledo@1:103/705 to GitLab note in main/sbbs on Friday, February 13, 2026 08:56:34