libsasl conflict

[Martin <martin.lyberg@gmail.com>]

Since a while back i'm getting conflicts upgrading libsasl2:

Reading package lists...
Building dependency tree...
The following packages will be REMOVED
  at logwatch mailscanner mailx postfix postfix-pcre The following NEW 
packages will be installed
  libsasl2-2
The following packages will be upgraded:
  libkrb53 libsasl2
2 upgraded, 1 newly installed, 6 to remove and 0 not upgraded.
Remv at [3.1.10]
Remv logwatch [7.3.1-2~bpo.1]
Remv mailscanner [4.51.5-1]
Remv mailx [1:8.1.2-0.20050715cvs-1]
Remv postfix-pcre [2.3.3-1~bpo.1]
Remv postfix [2.3.3-1~bpo.1]
Inst libsasl2-2 (2.1.22.dfsg1-8~bpo.1 Backports.org 
archive:sarge-backports) Inst libsasl2 [2.1.19.dfsg1-0.2] 
(2.1.22.dfsg1-8~bpo.1 Backports.org archive:sarge-backports) Inst 
libkrb53 [1.4.4-4~bpo.1] (1.4.4-5~bpo.1 Backports.org 
archive:sarge-backports) Conf libsasl2-2 (2.1.22.dfsg1-8~bpo.1 
Backports.org archive:sarge-backports) Conf libsasl2 
(2.1.22.dfsg1-8~bpo.1 Backports.org archive:sarge-backports) Conf 
libkrb53 (1.4.4-5~bpo.1 Backports.org archive:sarge-backports)

How can i solve this without removing logwatch, mailscanner and postfix. 
 Removing those packages would break my system.

Thanks in advance.