https://gitlab.synchro.net/main/sbbs/-/issues/966#note_7545
That log message is coming from sbbs, not dyndns, and sbbs doesn't know that the logged command-line contains a password.
To avoid this, put the password in the `[dyndns]` section of your `modopts.ini` file instead of on the command-line and include '-q' (quiet) on the dyndns command-line. That should resolve that.
--- SBBSecho 3.29-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)