WP Mailster


True two-way group communication over email

Erlaube es deinen Benutzern per E-Mail zu kommunizieren – ohne sich in eine Website einloggen zu müssen.
Ähnlich zu Programmen wie Mailman oder Listserv, erlaubt das Plugin eine Diskussions-Mailing-Liste zu betreiben.

That means that every email sent to a central email address is forwarded to the rest of the members of the list.
When members reply to such emails WP Mailster again forwards them to the other list recipients.
Unlike newsletter plugins this allows true two-way communication via email.

Verfügbare Funktionen:

  • Gruppenkommunikation über E-Mail
  • Nutzbar mit jedem POP3/IMAP E-Mail Postfach
  • Empfänger können im WordPress Adminbereich gemanaged werden
  • Benutzer können sich an- bzw. abmelden über Widgets auf der Website
  • Alle WP Benutzer können als Empfänger ausgewählt werden (zusätzliche Empfänger können gespeichert werden, ohne WP Benutzer anlegen zu müssen)
  • Benutzer können in Gruppen organisiert werden
  • Einzelne Benutzer oder ganze Benutzergruppen können als Empfänger von Mailing Listen hinzugefügt werden
  • Antworten auf Mailing Listen Nachrichten können an alle Empfänger (oder nur den Sender) gesendet werden
  • E-Mail Archiv zur Ansicht der gesendeten Nachrichten
  • Volle Unterstützung von HTML E-Mails und Anhängen
  • Individuelle Kopf- und Fußzeilen
  • Präfix für den Betreff
  • many more features

Note: This version of WP Mailster is FREE and limited in terms of number of lists and subscribers per list. Additional features such as captcha protection, double opt-in, email filtering, configurable event notifications, and many others are available in the premium editions.


  • The dashboard provides an overview of the overall status (mailing list, #emails etc)
  • All emails (that are forwarded to the subscribers) are also stored in an email archive in the admin section
  • Mailing list settings, general settings
  • Mailing list settings, mailbox (incoming email)
  • Mailing list settings, mailbox: choose from some pre-configured servers or use your own (what most users do)
  • Mailing list settings, sender settings (outgoing email)
  • Mailing list settings, mail content
  • Mailing list settings, list behaviour
  • Manage your recipients (per list and/or via custom groups)
  • Add members to your list (both WP users and users outside of WP are possible)


Wie kann ich E-Mails senden?

Wenn du WP Mailster nutzen willst, dann musst du keine Website aufrufen / dich einloggen und ein Formular aufrufen um eine Nachricht zu senden.
Stattdessen benutzt du einfach den E-Mail Client deiner Wahl.
Schreib einfach die E-Mail an die Mailing Listen Adresse. Das war es schon!
Benutze also Gmail, Outlook, Thunderbird, einen Webmailer – wie du willst. Hauptsache, du sendest deine Nachricht einfach an die E-Mail Adresse, die du in WP Mailster hinterlegt für deine Mailing Liste hinterlegt hast.

WArum brauchen E-Mails so lange um zugestellt zu werden? Wie kann ich das Senden beschleunigen?

WP Mailster setzt auf WordPress auf, welches eine PHP-basierende Webanwendung ist. Das heißt aus technischer Sicht, dass WP Mailster nicht aktiv werden kann, es sei denn, es wird von außen „getriggert“ (d.h. angestoßen). Außerdem kann es nur eine bestimmte Zeit nach dem Triggern laufen. Diese Limitierung kommen von PHP, nicht von WP Mailster oder WordPress.
Triggern heißt, dass jemand die Website aufruft. Während des Ladevorgangs der Website kann WP Mailster seine Aktionen (wie das E-Mail empfangen und senden) unterbringen. Daher können E-Mails nur gesendet/empfangen werden, wenn jemand die Website auch aufruft. Andernfalls wird die E-Mail Zustellung verzögert. Da nur wenige Websites jede Minute jeder Stunde jeden Tages aufgerufen werden, empfehlen wir, dass du einen Cronjob erstellst, der periodisch deine Website aufruft.
Dazu haben wir eine Anleitung auf unserer Website, wie ein Cronjob aufgesetzt wird.

Was sind Sendefehler?

Sendefehler sind Fehlermeldungen, die der E-Mail Server zurück an WP Mailster gibt.
Dabei sagt der Server im Grunde „Ich werde diese Nachricht nicht weiterleiten“. WP Mailster versucht einige Zeit erneut die Nachricht zu senden, aber wird an einem gewissen Punkt aufgeben.
Die Ursache können eine Reihe von Dingen sein. Zum Beispiel könnten mehr E-Mails (pro Minute / Stunde) versendet werden, als es vom E-Mail Anbieter erlaubt ist. Oder die E-Mails könnten Inhalte (z.B. zu viele Empfänger, zu größe Anhänge, …) enthalten, die der E-Mail Server nicht toleriert.
Du musst herausfinden, was die E-Mail Server konkret an WP Mailster als Fehlermeldung gibt. Bitte nutze dazu die Anleitung zur Fehlerbehebung auf unserer Website.


27. Januar 2022
This plugin is very feature-rich and powerful. It is really one of the only ones of its kind. I had a couple of issues when configuring it and testing it, but I received very fast and helpful replies from support. The plugin is perfect for many usage cases. Mine is simply that I have a WordPress website that used to use Google Groups. Google Groups is great, but everyone needs to have a Google account to access the web-based interface. Also, there is no easy way to sync Google Groups membership with your website's member data. Trust me, I have tried, but none of them work very well. Thanks to the developer for this great creation! Keep up the nice work.
7. Januar 2022
We have run Listservs on two member association websites for 7 years. We have used outside/non-wordpress vendors. We have used and tested other Wordpress plugins. We even built our own Wordpress solution that worked for us for a while. We've been working with WP Mailister now for about a year, and it has been by far the best solution for us. Simple set up. All of the options and features we could ever need. Excellent support and customer service. Comprehensive documentation. And it's so affordable. For the users, it is simple to use, and we love having the user-facing email archive. I would highly recommend this plugin if you're looking for a Wordpress listserv solution.
4. Januar 2022
We use the WP-Mailster Plug-in for our camera club emails. We use it in a number of different ways. 1. Mailing out to members any news about website updates and changes. 2, Distributing our newsletter [replies only go to sender] & 3, as a ListServ for our Committee emails and email discussions [replies go all to whole group]. I was unable to find any other plug-in that offered this level of flexibility, it was straightforward to implement and requires no maintenance. It is updated regularly and provides detailed logs to enable me to track down and managed undeliverable or bounced emails. Support is always timely and excellent. WakefieldCameraClub.org.uk
2. Januar 2022
Hi, After a year of searching (testing and subscribing to services) in order to replace the "mailman" product, which we gave in my case, some problems, I found this plugin, which solves what I need (enterprise edition). Doubts and possible questions about how to approach the service have been resolved quickly via email: fast, effective and efficient support. I encourage the developer to continue with his style of support that has sometimes gone beyond what he expected and to grow the project, which will surely be to the satisfaction of its customers. Joan
12. März 2021
We use the plugin with more than 20 mailing lists. The numerous setting options allow a flexible, stable and well to automate operation. Also the shortcodes and the frontend email archive are very helpful. The delivery times (Sprint Cronjob Service) could be a bit faster, but that's complaining about first world problems. The support is what you want it to be! Issue report - quick response with precise steps - fix on release level the next day! Great! So, we spent much time finding an appropriate listserv plugin - with all the common listserv problems - and WP Mailster is the solution.
3. Februar 2021
After trying another WP mailing list plugin and not getting it working (and getting very poor support) I switched to WP Mailster, and had a completely different experience. It was easy to set up, works well and integrates easily into our site. When there was a problem about server limitations, Holger from WP Mailster was ready to help and sorted it out for me in a friendly way. I really recommend this plugin to add an email listserv to your WordPress site.
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Mitwirkende & Entwickler

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Release Date – August 23rd, 2022

  • [Improvement] Store log file now in wp-content/uploads/wp-mailster directory to avoid problems on plugin updates/upgrades/downgrades
  • [Bug Fix] mst_emails shortcode’s list ID (lid) filter works again
  • [Bug Fix] Goodbye/welcome messages were not sent in some situations where admin changed list memberships
  • [Bug Fix] Support special characters in passwords (slash, „/“, was missing)


Release Date – July 27th, 2022

  • [Improvement] Update minimal system requirements to WP 5.3 (from 4.3) and PHP 5.6 (from 5.5)
  • [Bug Fix] Storing of attachments with long MIME subtypes (e.g. MS Office formats like docx format with: VND.OPENXMLFORMATS-OFFICEDOCUMENT.WORDPROCESSINGML.DOCUMENT) is supported and will not crash mail retrieving
  • [Bug Fix] Fix issues managing users with apostrophe in their names (like O’Neil)
  • [Bug Fix] Fix issues recording send events for users with apostrophe in their names
  • [Bug Fix] Omit PHP warnings like „DOMDocument::loadHTML(): Tag o:p invalid in Entity“
  • [Bug Fix] Fix issue with timestamps not taking WP timezone settings into account
  • [Bug Fix] A „mail not forwarded“ event not being sent out (due to random reasons) will not stop handling of mailing list mails (not cause email loop)
  • [Bug Fix] Failure to open the log file will not crash the process


Release Date – June 10th, 2022

  • [Feature] Introduce subscribe and unsubscribe shortcodes ([mst_subscribe] and [mst_unsubscribe])
  • [Improvement] UI optimization: full width for emails/lists/users/groups/servers/… table views
  • [Bug Fix] Fix for moderation mode: bounced/blocked/filtered emails will not produce a moderation request
  • [Bug Fix] Fix handling of certain binary attachments
  • [Bug Fix] Fix database issues (db maintenance) on WP multisite installations


Release Date – February 1st, 2022

  • [Improvement] CSV export also puts out the user description / notes
  • [Bug Fix] Increase plugin (lazy cronjob) stability to avoid edge cash crashes
  • [Bug Fix] Fix issue in CSV import
  • [Bug Fix] Show updated/created message when editing/saving/updating user
  • [Bug Fix] Show name of list being added in header


Release Date – December 12th, 2021

  • [Feature] Introduce options to deal with email hosters with a DMARC policy „reject“ setting
  • [Bug Fix] Hide irrelevant submenu entries more reliable
  • [Bug Fix] Better recognize requests for rest API
  • [Bug Fix] Avoid several PHP warnings and notices