View source for Qpsmtpd

{{lowercase|title=qpsmtpd}}
{{Infobox software
|name = qpsmtpd
|screenshot =
|logo =
|caption = a flexible smtpd daemon written in Perl
|developer = Ask Bjørn Hansen
|latest_release_version = 1.00
|latest_release_date = {{release date and age|2023|02|17}}<ref>{{cite web |title=Releases |url=https://github.com/smtpd/qpsmtpd/releases |website=Github |access-date=1 September 2019}}</ref>
|latest_preview_version =
|latest_preview_date =
|operating_system = [[Unix]]
|programming language = [[Perl]]
|genre = [[open-source software|open-source]], [[Mail transfer agent]]
|license = [[MIT license]]
|website = https://smtpd.github.io/qpsmtpd/
}}
'''qpsmtpd''' is an [[Simple Mail Transfer Protocol|SMTP]] [[Daemon (computer software)|daemon]] written in [[Perl]]. It was originally designed to be a drop-in replacement for ''qmail-smtpd'', the SMTP component of [[qmail]], and it is now also compatible with [[Postfix (software)|Postfix]], [[Exim]], [[sendmail]] and virtually any software that "speaks SMTP".  It has a flexible plugin system, making it easy to [[interoperate]] with other pieces in a mail system.
Its main purpose is to allow mail administrators to perform more advanced [[Spam (e-mail)|spam]] filtering than is possible with other SMTP daemons. As one example of dozens, the '''earlytalker''' plugin blocks many viruses and mass mailers based on their characteristic violation of basic [[SMTP|protocol]], even before they start sending mail data.
The program's main author is Ask Bjørn Hansen.  It is licensed under the [[MIT License]].
== Qpsmtpd Plugins ==
A defining virtue of qpsmtpd is its plugin system and collection of plugins. In addition to basic plugins qpsmtpd has a suite of additional plugins that provide integration with external mail filters and processors as well as implementations of many email technologies. The following list is just a few of the many qpsmtpd plugins.
{| class="wikitable"
|-
! Name !! Description
|-
| GeoIP<ref>{{cite web| url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/ident/geoip|title=GeoIP plugin|last=Simerson|first=Matt|website=[[GitHub]] }}</ref> || Use [[GeoIP]] databases to report geographic information about incoming connections, including distance in km. Assign negative karma from senders that are "too far" away.
|-
| p0f<ref>{{cite web|title=p0f plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/ident/p0f|publisher=github|last=Spier|first=Robert|access-date=25 April 2013}}</ref> || [[p0f]] uses TCP fingerprint info to identify the senders Operating System, network distance, and more.
|-
| karma<ref>{{cite web|title=Karma plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/karma|work=GitHub|access-date=25 April 2013}}</ref> || sender history. Treat senders differently based on message heuristics and sending history.
|-
| [[dnsbl]]<ref>{{cite web|title=DNSBL plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/dnsbl|work=GitHub|access-date=25 April 2013}}</ref>  || DNS blacklists
|-
| earlytalker<ref>{{cite web|title=Earlytalker plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/earlytalker|first= Devin|last=Carraway|work=GitHub|access-date=25 April 2013}}</ref>  || Assure the client doesn't talk before we send the SMTP banner
|-
| helo<ref>{{cite web|title=HELO plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/helo|work=GitHub|last=simerson|first=matt|access-date=25 April 2013}}</ref>  || validate the <code>HELO</code> or <code>EHLO</code> message presented by the sender
|-
| auth:*<ref>{{cite web|title=QP Authentication plugins|url=https://github.com/smtpd/qpsmtpd/tree/master/plugins/auth|work=GitHub|publisher=qpsmtpd|access-date=25 April 2013}}</ref>  || plugins for user authentication include vpopmail, checkpassword, flat_file, and ldap
|-
| SPF<ref>{{cite web|title=QP SPF plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/sender_permitted_from|work=GitHub|last=Sergeant|first=Matt|publisher=qpsmtpd|access-date=25 April 2013}}</ref>  || [[Sender Policy Framework]]
|-
| greylisting<ref>{{cite web|title=QP greylisting plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/greylisting|work=GitHub|publisher=qpsmtpd|last=Carr|first=Gavin|access-date=25 April 2013}}</ref>  || temporary deferrals for unknown senders
|-
| headers<ref>{{cite web|last=Simerson|first=Matt|title=QP headers plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/headers|work=GitHub|publisher=qpsmtpd|access-date=25 April 2013}}</ref>  || message header validation
|-
| URIBL<ref>{{cite web|last=Devin|first=Carraway|title=QP URIBL plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/uribl|work=GitHub|publisher=qpsmtpd|access-date=25 April 2013}}</ref>  || scan message content for blacklisted URLs
|-
| [[Domainkeys]]<ref>{{cite web|last=Peacock|first=John|title=QP Domainkeys plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/domainkeys|work=GitHub|publisher=qpsmtpd|access-date=25 April 2013}}</ref>  || validate domainkeys signatures on incoming mail
|-
| [[DKIM]]<ref>{{cite web|title=QP DKIM plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/dkim|work=GitHub|last=Simerson|first=Matt|publisher=qpsmtpd}}</ref>  || validate DKIM signatures and DKIM sign outgoing messages
|-
| [[DMARC]]<ref>{{cite web|title=QP dmarc plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/dmarc|first=Matt|last=Simerson|work=GitHub|publisher=qpsmtpd|access-date=25 April 2013}}</ref>  || implements the draft DMARC specification for email authentication
|-
| [[SpamAssassin]]<ref>{{cite web|title=QP spamassassin plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/spamassassin|work=GitHub|publisher=qpsmtpd|access-date=25 April 2013}}</ref>  || the venerable spam detector
|-
| dspam<ref>{{cite web|title=QP dspam plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/dspam|work=GitHub|publisher=qpsmtpd|first=Matt|last=Simerson|access-date=25 April 2013}}</ref>  || [[DSPAM]] is a bayesian anti-spam filter optimized for speed.<ref>{{cite web|title=Dspam web site|url=http://sourceforge.net/apps/mediawiki/dspam/index.php?title=Main_Page|work=sourceforge|access-date=25 April 2013}}</ref>
|-
| AntiVirus<ref>{{cite web|title=QP anti-virus plugins|url=https://github.com/smtpd/qpsmtpd/tree/master/plugins/virus|work=GitHub|publisher=qpsmtpd|access-date=25 April 2013}}</ref>  || A collection of plugins for AVE, Bitdefender, [[ClamAV]], hbevd, Sophie, and uvscan
|-
| FCrDNS<ref>{{cite web|last=Simerson|first=Matt|title=QP FCrDNS plugin|url=https://github.com/smtpd/qpsmtpd/blob/master/plugins/fcrdns|work=GitHub|publisher=qpsmtpd|access-date=25 April 2013}}</ref>   || validate sender has [[FCrDNS]] configured
|}
{{Reflist}}
==See also==
{{Portal|Free and open-source software}}
* [[Anti-Spam SMTP Proxy]]
==Further reading==
* [http://www.oreillynet.com/pub/a/sysadmin/2005/09/15/qpsmtpd.html Using qpsmtpd]
* [http://searchenterpriselinux.techtarget.com/tip/0,289483,sid39_gci1235770,00.html TechTarget article on qpsmtpd]
* [http://www.taint.org/2007/04/17/132339a.html Using qpsmtpd for traps.spamassassin.org]
==External links==
* [https://smtpd.github.io/qpsmtpd/ - Qpsmtpd Web site]
* [http://wiki.qpsmtpd.org/ qpsmtpd wiki]
* [http://www.ohloh.net/p/qpsmtpd Ohloh page]
* {{Freshmeat|qpsmtpd|qpsmtpd}}
[[Category:Free software programmed in Perl]]
[[Category:Message transfer agents]]
[[Category:Perl software]]
[[Category:Software using the MIT license]]
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