Postfix

https://help.ubuntu.com/community/Postfix

Packages

root@weasel:/var/log# dpkg -l *postfix*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                       Version                    Description
+++-==========================-==========================-====================================================================
ii  postfix                    2.5.1-2ubuntu1             High-performance mail transport agent

Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-==========================-==========================-==================================================================== pn libsasl2 <none> (no description available) ii libsasl2-2 2.1.22.dfsg1-18ubuntu2 Cyrus SASL - authentication abstraction library ii libsasl2-modules 2.1.22.dfsg1-18ubuntu2 Cyrus SASL - pluggable authentication modules ii sasl2-bin 2.1.22.dfsg1-18ubuntu2 Cyrus SASL - administration programs for SASL users database