That was it, Rolf. I will now perform a facepalm and be on my merry way.  Thanks.

MercuryS used to log connections such as the following:

T 20090413 173213 49e3718a Connection from 209.191.125.112
T 20090413 173213 49e3718a HELO web38906.mail.mud.yahoo.com
T 20090413 173213 49e3718a MAIL FROM:<external@yahoo.com>
T 20090413 173213 49e3718a RCPT TO:<internal@mail.bradford-co.org>
T 20090413 173213 49e3718a DATA
T 20090413 173213 49e3718a DATA - 71 lines, 4303 bytes.
T 20090413 173213 49e3718a QUIT
T 20090413 173213 49e3718a Connection closed with 209.191.125.112, 0 sec. elapsed.

That is the last proper log I received.  After that all I get is:

T 20090413 173352 49e3718b Connection from 206.57.6.146
T 20090413 173357 49e3718c Connection from 172.16.4.51
T 20090413 173357 49e3718c Connection closed with 172.16.4.51, 0 sec. elapsed.
T 20090413 173358 49e3718b Connection closed with 206.57.6.146, 6 sec. elapsed.

What have I done wrong?

[quote user="ryanj"]

MercuryS used to log connections such as the following:

T 20090413 173213 49e3718a Connection from 209.191.125.112
T 20090413 173213 49e3718a HELO web38906.mail.mud.yahoo.com
T 20090413 173213 49e3718a MAIL FROM:<external@yahoo.com>
T 20090413 173213 49e3718a RCPT TO:<internal@mail.bradford-co.org>
T 20090413 173213 49e3718a DATA
T 20090413 173213 49e3718a DATA - 71 lines, 4303 bytes.
T 20090413 173213 49e3718a QUIT
T 20090413 173213 49e3718a Connection closed with 209.191.125.112, 0 sec. elapsed.

That is the last proper log I received.  After that all I get is:

T 20090413 173352 49e3718b Connection from 206.57.6.146
T 20090413 173357 49e3718c Connection from 172.16.4.51
T 20090413 173357 49e3718c Connection closed with 172.16.4.51, 0 sec. elapsed.
T 20090413 173358 49e3718b Connection closed with 206.57.6.146, 6 sec. elapsed.

What have I done wrong?

 Not sure.  This log indicates that you are not receiving any mail at all via MercuryS.  Are you actually receiving any mail?  What does a MercuryS session log show?

[/quote]

Sorry to revive an old, old thread, but this problem has recently been dumped back into my lap.

 My session logs look good, I get a clear record of the entire conversation:

20:59:23.656: Connection from 174.137.160.243, Thu Jul 02 20:59:22 2009<lf>
20:59:23.671: << 220 mail.bradfordco.org ESMTP server ready.<cr><lf>
20:59:23.703: >> HELO 160-243-ssl.imporpo.com<cr><lf>
20:59:23.703: << 250 mail.bradfordco.org Hello, 160-243-ssl.imporpo.com.<cr><lf>
20:59:23.750: >> MAIL FROM: <ret@160-243-ssl.imporpo.com><cr><lf>
20:59:23.750: << 250 Sender OK - send RCPTs.<cr><lf>
20:59:23.781: >> RCPT TO: <internal@mail.bradfordco.org><cr><lf>
20:59:23.796: << 250 Recipient OK - send RCPT or DATA.<cr><lf>
20:59:23.828: >> DATA<cr><lf>

<<MESSAGE>>

20:59:24.500: << 250 Data received OK.<cr><lf>
20:59:24.531: --- Connection closed normally at Thu Jul 02 20:59:24 2009. ---
20:59:24.531:  

 Yet, I still get no details in MercuryS.LOG.  I'd run with session logs if I had the disk space to accomodate them, but I'm sure that there is something silly that's happened to turn off the extra details in the log.  Any help would be appreciated.

Yet, I still get no details in MercuryS.LOG.  I'd run with session

logs if I had the disk space to accommodate them, but I'm sure that

there is something silly that's happened to turn off the extra details

in the log.  Any help would be appreciated.

There are no specific settings in the MercuryS logging to control this but there may be some other setting that is incorrect.   Check the settings in the mercury.ini file.  I get normal logs and here's all my settings. 

[MercuryS]
Debug : 1
HELO : tstephenson.com
Logfile : C:\MERCURY\Logs\MERCURYS\mers~y~m.LOG
Timeout : 30
Relay : 0
Strict_Relay : 1
Alt_Server_Port : 587
Allow_Illegals : 0
SMTP_Authentication : 1
Auth_File : c:\mercury\mercury\pass.txt
Killfile : c:\pmail\mail\thomas\killfile.pml
Session_logging : c:\mercury\logs\mercurys
Session_logmode : 0
Compliance_Settings : 288
Maximum_Failed_Rcpts : 4
Max_Relay_Attempts : 4
SSL_Mode : 1
SSL_Certfile : c:\mercury\filename.cer
ST_Blacklisting : 0
No_VRFY : 1
SMTP_ConnFlags : 0

Do you have "Display session progress and debugging information" checked in MercuryS configuration? That's the only setting I know of that could affect logging detail level.

/Rolf