BBS:      TELESC.NET.BR
Assunto:  POP3 server doesn't support "reauthentication"
De:       Rob Swindell
Data:     Wed, 15 Apr 2026 00:07:35 -0700
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https://gitlab.synchro.net/main/sbbs/-/issues/1123#note_8804

The USER and PASS commands end up logged as unsupported commands and rejected by the server:
```
  4/15  12:03:46a  9476 POP3   !UNSUPPORTED COMMAND: 'USER user name'
  4/15  12:03:46a  9476 POP3   !UNSUPPORTED COMMAND: 'PASS secret'
```
Once authenticated, these commands are rejected by the mail server and that can confuse ThunderBird as it sometimes reuses the same already-connected TCP socket to get new mail and attempt to authenticate a second time.
--- SBBSecho 3.37-Linux
 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

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