BBS:      TELESC.NET.BR
Assunto:  Win32 debug heap assertion after reading a cached filter filter while
De:       Rob Swindell
Data:     Wed, 11 Mar 2026 20:31:12 -0700
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https://gitlab.synchro.net/main/sbbs/-/issues/1099#note_8555

Here's an example mail server log (breadcrumbs) from a reproduction case:
```
  3/9  07:39:31p  Synchronet Mail Server Version 3.21d Debug
  3/9  07:39:31p  Compiled master/4fe0bb198 Mar 09 2026 17:35 with MSC 1944
  3/9  07:39:31p  Initializing on Mon Mar  9 19:39:31 2026 with options: 1c665d
  3/9  07:39:31p  Loading configuration files from s:\sbbs\ctrl\
  3/9  07:39:32p  MQTT connecting to broker 192.168.1.2:1883
  3/9  07:39:32p  SMTP Transfer Agent listening on socket 0.0.0.0 port 25
  3/9  07:39:32p  SMTP Transfer Agent listening on socket :: port 25
  3/9  07:39:32p  SMTP Submission Agent listening on socket 0.0.0.0 port 587
  3/9  07:39:32p  SMTP Submission Agent listening on socket :: port 587
  3/9  07:39:32p  POP3 Server listening on socket 0.0.0.0 port 110
  3/9  07:39:32p  Mail Server thread started
  3/9  07:39:33p  Mail Server terminate
  3/9  07:39:34p  0000 Waiting for 1 child threads to terminate
  3/9  07:39:34p  1292 SMTP  [158.94.208.215] Connection accepted on 71.95.196.34 port 25 from port 51260
  3/9  07:39:39p  1292 SMTP  [158.94.208.215] Hostname: 
  3/9  07:39:39p  1292 SMTP  [158.94.208.215] !CLIENT BLOCKED in s:\sbbs\text\ip.can since Mar  9 01:46:33 2026 for 3 FAILED LOGIN ATTEMPTS in 59.2m using SMTP (1 total)
  3/9  07:39:39p  0000 Done waiting for child threads to terminate
  3/9  07:39:39p  1848 SMTP Transfer Agent closing socket 0.0.0.0 port 25
  3/9  07:39:39p  1224 SMTP Transfer Agent closing socket :: port 25
  3/9  07:39:39p  1388 SMTP Submission Agent closing socket 0.0.0.0 port 587
  3/9  07:39:39p  1752 SMTP Submission Agent closing socket :: port 587
  3/9  07:39:39p  1384 POP3 Server closing socket 0.0.0.0 port 110
  3/9  07:39:39p  #### Mail Server thread terminated (1 connections served, 1 ip-filtered, 0 messages received, 2 concurrent clients)

```
--- SBBSecho 3.37-Linux
 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

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