ESMTP Fails to send scans (BDAT Errors, Chunking, 6 Minute Timeout)

Owned by Jun Dockins (Deactivated)
Last updated: Jul 06, 2016

Problem

When performing a scan using SMTP (Scan to Email / Scan to Me) through an ESMTP relay, a number of issues can occur which may indicate chunking should be disabled for SMTP transmission in ScanPath:

BDAT command has been rejected by the server. The server responded: 451 4.7.0 Temporary server error. Please try again later. PRX5 .
BDAT command has been rejected by the server. The server responded: 421 4.4.1 Connection timed out.

Example SMTP Log. (Data chunks will fail at irregular intervals)

[13:24:46.45] [SEND] [Data chunk of 8192 bytes sent.]
[13:24:51.47] [RECV] 250 2.6.0 CHUNK received OK, 8192 octets\r\n
[13:24:51.47] [SEND] BDAT 8192\r\n
[13:24:51.47] [SEND] [Data chunk of 8192 bytes sent.]
[13:24:56.48] [RECV] 250 2.6.0 CHUNK received OK, 8192 octets\r\n
[13:24:56.48] [SEND] BDAT 8192\r\n
[13:24:56.48] [SEND] [Data chunk of 8192 bytes sent.]
[13:25:01.50] [RECV] 451 4.7.0 Temporary server error. Please try again later. PRX5 \r\n
[13:25:01.51] [INFO] Error: BDAT command has been rejected by the server. The server responded: 451 4.7.0 Temporary server error. Please try again later. PRX5 .
[13:25:01.51] [INFO] Will reset SMTP session.
[13:25:01.51] [SEND] RSET\r\n

Solution

  1. Disable SMTP Chunking in ScanPath.
    1. Create the file SMTPDisableChunking.dat in the ScanPath Server installation folder. (Default is C:\Program Files (x86)\Prism Software\ScanPath\Server\).
    2. Edit SMTPDisableChunking.dat (using Notepad) and type in the value TRUE with no other text on the first line.
    3. Restart the ScanPath Server Service.
     

Applies To

ScanPath 3.4.x or higher.