The Socket read and Write errors I'm treating as warnings, it's the Session timeout with 0 sent, 0 rcvd, 0 skip that causes me to say it failed:
FIDOPOLL Version 1.12 A36

Scanning 21:1/145
Queued 1 files (496 bytes) to 21:1/145
Polling BINKP node 21:1/145
Connecting to bcw142.zapto.org:24556
Connected
Socket Write error 25
Socket Write error 25
Socket Write error 25
Socket Write error 25
Socket read error 25
Socket Write error 25
Socket read error 25
Sending: fffe0000.we0 (496 bytes)
Socket Write error 25
Socket read error 25
Socket Write error 25
Receiving: 00000003.sa0 (61,003 bytes)
Socket Write error 25
Socket Write error 25
Socket Write error 25
Socket read error 25
Session timeout
Session complete (0 sent, 0 rcvd, 0 skip)

I've also found that when replying to a point in netmail the point is
dropped. So if you reply from 21:1/145 to 21:1/145.2 it tries to sent to 21:1/145 instead of 21:1/145.2. You can just rewrite the address and it works fine. So basically the point is dropped in netmail reply and it shouldn't be.

--- Mystic BBS v1.12 A35 (Raspberry Pi/32)
* Origin: Mystic Pi BBS bcw142.zapto.org (21:1/145)