Hello, 

When you are combining the logs what logs are you combining. Generally when I am trying to track an issue I can get 90% of what I need from the SMTP and Delivery logs ( set to Detailed ) and if there is a SPAM scoring/checks issue I would also review the "Spam Checks" log. 

Here is an example of the flow. 

--- SMTP ---

[2019.05.13] 09:56:38.309 [216.167.205.23][27287719] rsp: 250 OK
[2019.05.13] 09:56:38.309 [216.167.205.23][27287719] Received message size: 1739 bytes
[2019.05.13] 09:56:38.309 [216.167.205.23][27287719] Successfully wrote to the HDR file. (c:\SmarterMail\Spool\SubSpool4\43956210.hdr)
[2019.05.13] 09:56:38.309 [216.167.205.23][27287719] Data transfer succeeded, writing mail to 43956210.eml (MessageID: <c66b224822df45adb130661165f5b441@ap-email.com>)
[2019.05.13] 09:56:38.394 [216.167.205.23][27287719] cmd: QUIT
[2019.05.13] 09:56:38.394 [216.167.205.23][27287719] rsp: 221 Service closing transmission channel
[2019.05.13] 09:56:38.394 [216.167.205.23][27287719] disconnected at 5/13/2019 9:56:38 AM

Here you can see that the SMTP session wrote to 43956210.eml. By taking the last 5 of this number you can grab the session information from the DELIVERY and the SPAM CHECK logs. 

--- DELIVERY --- 

[2019.05.13] 09:56:41.126 [56210] Delivery started for {FROM_ADDRESS} at 9:56:41 AM
[2019.05.13] 09:56:47.147 [56210] Added to SpamCheckQueue (1 queued; 0/30 processing)
[2019.05.13] 09:56:47.147 [56210] [SpamCheckQueue] Begin Processing.
[2019.05.13] 09:56:47.241 [56210] Starting Spam Checks.
[2019.05.13] 09:56:47.441 [56210] Spam check results: [REVERSE DNS LOOKUP: 0,None], [NULL SENDER: 0,passed], [_CYREN: 0,Unknown], [_MESSAGESNIFFER: 0,code:0], [_INTERNALSPAMASSASSIN: 0:0], [_SPF: 25,None], [_DKIM: 0,Pass], [BARRACUDA - RBL: 0,passed], [CBL - ABUSE SEAT: 0,passed], [FIVE-TEN: 0,passed], [HOSTKARMA - BLACKLIST: 0,passed], [HOSTKARMA - BROWNLIST: 0,passed], [MAILSPIKE Z: 0,passed], [NOABUSE: 0,passed], [NOPOSTMASTER: 0,passed], [PROTECTED SKY - RED: 0,passed], [PROTECTED SKY - YELLOW: 0,passed], [RFC2 REALTIME LIST: 0,passed], [SEM-FRESH: 0,passed], [SORBS 02 - HTTP: 0,passed], [SORBS 03 - SOCKS: 0,passed], [SORBS 04 - MISC: 0,passed], [SORBS 05 - SMTP: 0,passed], [SORBS 06 - RECENT: 0,passed], [SORBS 07 - WEB: 0,passed], [SORBS 08 - BLOCK: 0,passed], [SORBS 09 - ZOMBIE: 0,passed], [SORBS 10 - DYNAMIC IP: 0,passed], [SORBS 11 - BAD CONFIG: 0,passed], [SORBS 12 - NOMAIL: 0,passed], [SORBS 13 - NOSERVER: 0,passed], [SPAMCOP: 0,passed], [SPAMHAUS - PBL 1: 0,passed], [SPAMHAUS - PBL 2: 0,passed], [SPAMHAUS - SBL 1: 0,passed], [SPAMHAUS - SBL 2: 0,passed], [SPAMHAUS - XBL 1: 0,passed], [SPAMHAUS - XBL 2: 0,passed], [SPAMHAUS - XBL 3: 0,passed], [SPAMHAUS - XBL 4: 0,passed], [SPAMHAUS - ZEN: 0,passed], [SPAMRATS: 0,passed], [SURBL - JWSPAMSPY: 0,passed], [SURBL – MALWARE: 0,passed], [SURBL – PHISHING: 0,passed], [SURBL – SA BLACKLIST: 0,passed], [SURBL - SPAMASSASSIN: 0,passed], [SURBL – SPAMCOP WEB: 0,passed], [SURRIEL: 0,passed], [UCEPROTECT LEVEL 1: 0,passed], [UCEPROTECT LEVEL 2: 0,passed], [UCEPROTECT LEVEL 3: 0,passed], [VIRUS RBL - MSRBL: 0,passed]
[2019.05.13] 09:56:47.441 [56210] Spam Checks completed.
[2019.05.13] 09:56:47.441 [56210] Removed from SpamCheckQueue (0 queued or processing)
[2019.05.13] 09:56:50.158 [56210] Added to LocalDeliveryQueue (0 queued; 1/50 processing)
[2019.05.13] 09:56:50.158 [56210] [LocalDeliveryQueue] Begin Processing.
[2019.05.13] 09:56:50.158 [56210] Starting local delivery to {TO_ADDRESS}
[2019.05.13] 09:56:50.173 [56210] Delivery for {FROM _ADDRESS} to {TO_ADDRESS} has completed (Delivered) Filter: None
[2019.05.13] 09:56:50.173 [56210] End delivery to {TO_ADRESS} (MessageID: <c66b224822df45adb130661165f5b441@ap-email.com>)
[2019.05.13] 09:56:50.173 [56210] Removed from LocalDeliveryQueue (0 queued or processing)
[2019.05.13] 09:56:53.158 [56210] Removing Spool message: Killed: False, Failed: False, Finished: True
[2019.05.13] 09:56:53.158 [56210] Delivery finished for postmaster@ap-email.com at 9:56:53 AM    [id:43956210]

To get detailed Spam check information you grab the same session number and check the spam logs

--- SPAM CHECKS ---

09:56:47.147 [56210] SpamCheck Processing Thread Started
09:56:47.147 [56210] Starting ClamD Check.
09:56:47.163 [56210] ClamD Checks completed.
09:56:47.163 [56210] Starting Cyren checks.
09:56:47.241 [56210] Cyren Checks completed.
09:56:47.241 [56210] Starting Command Line Checks.
09:56:47.241 [56210] Command Line Checks completed.
09:56:47.241 [56210] Starting Filetype Checks.
09:56:47.241 [56210] Filetype Checks completed.
09:56:47.241 [56210] Spam checks to run: Reverse Dns Lookup, Null Sender, Cyren, Message Sniffer, ...
09:56:47.241 [56210] Found 53 spam checks to run: Reverse Dns Lookup, Null Sender, Cyren, Message ...
09:56:47.241 [IP_ADDRESS] Could not parse IP, resolving reverse dns check as None.
09:56:47.301 Running SPF check on 56210
09:56:47.301 Finished SPF check on 56210; result = None
09:56:47.301 [56210] [DKIM] Performing DKIM check...
09:56:47.347 [56210] [DKIM] Result: Good.
09:56:47.441 [56210] Spam Checks completed.
09:56:47.441 [56210] SpamCheck Processing Thread Completed

The three logs here should get most of the data that you need. I would be happy to submit a feature request for you as well. What information are you lookin got have in this new comprehensive log so that I can add that to the feature request. 

Thank you