Running iRedMail-0.8.5 on RHEL 6.4 in AWS, using MySQL for storage

In my primary account I receive the following every day in logwatch now:

WARNING: Local version: 0.98 Recommended version: 0.98.1

Full error log:

--------------------- clam-update Begin ------------------------

Last ClamAV update process started at Wed Jan 15 03:40:06 2014

Last Status:
    WARNING: Your ClamAV installation is OUTDATED!
    WARNING: Local version: 0.98 Recommended version: 0.98.1
    DON'T PANIC! Read http://www.clamav.net/support/faq
    main.cvd is up to date (version: 55, sigs: 2424225, f-level: 60, builder: neo)
    Downloading daily-18350.cdiff [100%]
    Downloading daily-18351.cdiff [100%]
    Downloading daily-18352.cdiff [100%]
    Downloading daily-18353.cdiff [100%]
    daily.cld updated (version: 18353, sigs: 651663, f-level: 63, builder: neo)
    bytecode.cld is up to date (version: 235, sigs: 44, f-level: 63, builder: dgoddard)
    Database updated (3075932 signatures) from db.us.clamav.net (IP: 155.98.64.87)

---------------------- clam-update End -------------------------

It seems to be ignorable, but then on the other hand, seems to affect the ability to receive mail to some degree now, where accounts were completely able to before.  Trying

yum update clamav

says

Loaded plugins: amazon-id, rhui-lb, security
Setting up Update Process
No Packages marked for Update

Uninstalling and reinstalling seems to just do the same thing.  I'm guessing there isn't a package for the latest version for this Linux Repo yet; but there aren't great instructions on how to build from scratch, and whether that would even simply "plug in" to the current setup without breaking it.

The only other confusing thing I see in the log relates to Amavisd:

--------------------- Amavisd-new Begin ------------------------

**Unmatched Entries**
        1   (30209-01) Passed CLEAN {RelayedInternal}, MYUSERS <root@mail.(mydomain)> -> <root@mail.(mydomain)>, Message-ID: <20140115084005.C5F3F24519@mail.(mydomain)>, mail_id: ed0KTcChtqgQ, Hits: -0.001, size: 4646, queued_as: E5D872452B, 2164 ms
        1   No ext program for   .tnef, tried: tnef
        1   No decoder for       .doc
        1   No ext program for   .rar, tried: unrar, rar
        1   Deleting db files nanny.db,__db.002,__db.003,__db.001,__db.004,snmp.db in /var/spool/amavisd/db
        1   No ext program for   .doc, tried: ripole
        1   (30208-01) Passed CLEAN {RelayedInternal}, MYUSERS <root@mail.(mydomain)> -> <root@mail.(mydomain)>, Message-ID: <20140115083004.34C8124436@mail.(mydomain)>, mail_id: M1QlK45hLFBB, Hits: 0, size: 2065, queued_as: 952692450C, 1228 ms

---------------------- Amavisd-new End -------------------------

Hard to read this one; not sure if this is reporting an error or if this is standard output for Amavisd logs.