TZUTC: -0800
MSGID: 58811.sync_sys@1:103/705 2d7723e9
PID: Synchronet 3.21a-Linux master/88b423313 Sep 29 2025 GCC 12.2.0
TID: SBBSecho 3.31-Linux master/d39e01091 Nov 03 2025 GCC 12.2.0
BBSID: VERT
CHRS: UTF-8 4
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/issues/1004#note_7844

Likely just verifying that both addresses in the INTL line are in the same
domain would be enough.
--- SBBSecho 3.31-Linux
 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)
SEEN-BY: 10/0 1 102/401 103/1 13 17 705 105/81 106/201 124/5016 128/187
SEEN-BY: 129/14 153/7715 154/110 214/22 218/0 1 215 601 610 700 840
SEEN-BY: 218/860 880 226/30 227/114 229/110 112 206 317 400 426 428
SEEN-BY: 229/470 700 705 266/512 280/464 291/111 301/1 320/219 322/757
SEEN-BY: 342/200 396/45 460/58 633/280 712/848 902/26 5075/35
PATH: 103/705 218/700 229/426