[SFOS 18.5MR3] Poor spam detection after update to Sophos Anti-Spam Interface

Hello,

Would it be possible to get the output of the /log/u2d.log and /log/sasi.log as well as a few samples .eml files via DM (especially interested in the X-SASI-* headers) so I can provide this info to the pertinent team to investigate.

Regards,

2022-04-04.18:20:31 ERROR [Main] [ precompile.cpp:647] Downloaded file could not be verified with checksum. Discarding /sdisk/sasi/asdb.tmp
2022-04-04.18:21:22 ERROR [Main] [ laseserver.cpp:159] Couldn't fetch new signatures: Downloaded file could not be verified with checksum. Discarding /sdisk/sasi/asdb.antispam Exiting..

DB errors are back too:

2022-04-04.21:23:57 ERROR [Main] [ precompile.cpp:715] Downloaded file could not be verified with checksum. Discarding /sdisk/sasi/asdb.delta
2022-04-04.23:24:07 ERROR [Main] [ precompile.cpp:697] Downloaded file could not be verified with checksum. Discarding /sdisk/sasi/asdb.tmp
2022-04-05.05:32:44 ERROR [Main] [ precompile.cpp:661] Couldn't fetch: sasi.sophosupd.com/.../asdb.antispam.old.csum
2022-04-05.05:40:45 ERROR [Main] [ precompile.cpp:661] Couldn't fetch: sasi.sophosupd.com/.../asdb.antispam.old.csum
2022-04-05.05:48:38 ERROR [Main] [ precompile.cpp:724] Precompile exception: Failed to apply delta to signatures.
2022-04-05.06:09:01 ERROR [ 3] [ DNS/Request.cpp:246] vector::_M_range_check
2022-04-05.08:12:47 ERROR [Main] [ precompile.cpp:697] Downloaded file could not be verified with checksum. Discarding /sdisk/sasi/asdb.tmp
2022-04-05.17:01:28 ERROR [Main] [ precompile.cpp:715] Downloaded file could not be verified with checksum. Discarding /sdisk/sasi/asdb.delta
2022-04-05.18:21:36 ERROR [Main] [ precompile.cpp:697] Downloaded file could not be verified with checksum. Discarding /sdisk/sasi/asdb.tmp
2022-04-05.19:25:38 ERROR [Main] [ precompile.cpp:715] Downloaded file could not be verified with checksum. Discarding /sdisk/sasi/asdb.delta

Hello Bart,

Thank you for the email Samples.

I have submitted them to the pertinent team.

Regards,

Hi Emmanuel,

I think I have the DB errors resolved.

On this line 2022-04-05.05:32:44 ERROR [Main] [ precompile.cpp:661] Couldn't fetch: sasi.sophosupd.com/.../asdb.antispam.old.csum

It says cant fetch, so I checked sasi.sophosupd.com with nslookup, found out that it has only an ipv4 address. I have both ipv4 and ipv6 and I have ipv6 on priority in the dns page, changed that to ipv4 and, no errors anymore. Maybe you could check this on your end why the sasi update server has no ipv6 address, or at leased no dns pointing to it.

So maybe ipv6 is the whole problem with sasi, i did not have any spam detection problems with previous firmware so it could be.

Now I've got to wait for spam...

I folded, reverted to mr2, spam is detected normally now. 

Interesting to see. Did you test the new sophos spam engine with v19 EAP2 too?
My SG-home is running with it but i have no mail server to test it.

It is supposed to work on imap/s and as far as I can see does not.

Ian

Problem also exist in v19EAP2.
I'm back to v18.5MR2 and all anti-spam features working fine.

I am using v19 eAP2. I have two mail accounts with the ISP, there is only one IP4 mail rule and one IPv6 mail rule which is not passing traffic. Tonight I started a detailed investigation in the spam issue. I received a spam mail message which I cannot find in the XG logviewer - mail tab. The  message does not appear in the mail quarantine log.

So, conclusion, the messages are not examined by the XG mail function therefore a bug.

Ian

So, when I forward the message to my other accounts, it is scanned by the XG, but not tagged as spam. Thinking about this, the result is as expected because the original message is not being used as a source server.

Hello Bart,

Thank you for the update. 

I have replied to your DM with some additional info.

Regards,

Hello Ian,

I have replied to your DM. 

Regards,

Hello Ian,

I have replied to your DM. 

Regards,