#mailcow — Public Fediverse posts

RE: https://red.fox.yt/@coltofox/117171580672580504

This is finally resolved as of 2:20am last night after hours of migrating 18 domains, 34 mailboxes, 196 aliases, 1 distribution list, and 6 forwarders from Zimbra ZCS FOSS to mailcow. I'll note my technical journey down below if you're interested.

:blobfoxcomfycomputer:

This has been ongoing effort since the compromise last Friday with investigations into some solutions.

I thought about building Zimbra from source then stopped myself from the nightmare of management overhead of maintaining that.

So I looked at the directly compatible platform, Carbonio. I spun up a Rocky 10 VM to replace this (Rocky 9 is EOL next year so can't do that). I managed to get Carbonio EL9 installed on Rocky 10 but couldn't get the post-install script to run since it required Perl 5.32 when EL10 ships with Perl 5.40. I tried installing EL9 Perl but there were too many dependencies, then I tried Perlbrew but it would keep trying the system one regardless of the symlinks I'd try -- even tried using the system one but it didn't budge either.

So dependency hell kicked in and I thought, well maybe they have a docker container. So I installed docker on the Rocky 10 VM, got that all setup. But then I look at the Docker Hub page and while an image does exist, there is zero documentation anywhere and the last image was 8 months ago. So I lost confidence there.

Through the investigation on this journey of migrating away off of Zimbra Open Source I kept seeing references to mailcow. So I tried a demo of mailcow to grasp the platform. The demo didn't really convince me to like it, I still prefer the UI Zimbra had (especially the admin UI) but it seemed it could almost do everything I needed.

So I eventually got the mailcow docker containers up and running. The migration was a lot of busywork since I didn't really want to touch the old Zimbra Database.

I migrated every mailbox one-by-one, creating the accounts all from scratch then did the (imap)sync afterward. The aliases were a bit easier, I could grep a zmprov command on the old server to query a user then paste them into mailcow in bulk.

Then there was DNS... For the public BIND servers I could sed the MX and SRV records to the new hostname but I still had to enter and split up 18 DKIM records. Had to manually update some Cloudflare domains, then also all of the internal (split) DNS records too.

Then there was TLS... So I haven't completely finished this yet, but it's enough for mail transport. I can't use mailcow-acme because it doesn't support RFC 2136 so I had to look into manual certificates (still ACME, but OS level). Then I had to find out how I could handle 18 different domains in SNI instead of 1 giant certificate. Turned out this was possible, and I've configured the default domain (that the hostname uses). I still need to configure the other 17 domains but the groundwork is there for when I get around configuring all those autoconfig/autodiscover certs.

With that out of the way, the main migration completed. Some systems recognised the new server as the same one after I put in the CNAME from old to new. Some didn't and I'm gradually fixing those as I find them (stricter auth requirements, etc).

One thing I will say I like about mailcow is Exchange ActiveSync. Zimbra always kept that as a paid feature. This finally enables me to have push notifications and proper calendar sync. I noticed there was a note last year from the SOGO team that they planned to remove ActiveSync, I'm so glad they reversed that decision.

After almost a week with almost no email I see how important this server actually is. I installed Zimbra ZCS roughly 5 years ago to exit Google Workspace and I'm still glad I did.

Having control over the data directly is empowering to not have some big corporation feeding it into their AI models with a force opt-in approach (i.e. Google) or alternatives with questionable political views (i.e. Proton). Keep email decentralised!

Anyway, I'm happy I have email again now. Thanks for reading! :blobfoxheart:

#Zimbra #mailcow #email #server #selfhosting #cve202673570

Comment quitter les GAFAM : Mails, contacts, calendriers (ep 3)

https://videos.stackgui.de/w/jEkjMRJj7RbvK8C785QZfW

@[email protected] The last time I went to RightsCon was in 2011! Feels like an eon ago, but looking through all my old emails many of the same themes came up then too.

(so glad I moved off gmail and consolidated all my email accounts going back 25+ years on my self-hosted #mailcow server! thank you @doncow for providing this incredible product!)

#digitallysovereign

@[email protected] FYI @doncow would be good to get more #mailcow users into these calls, contributing to the direction of SOGo, the webmail that ships with mailcow.

#digitallysovereign

𝗠𝗮𝗶𝗹𝗰𝗼𝘄:

#MailServer #UI #Mailcow

https://thewhale.cc/posts/mailcow

Mailcow is a complete mail server suite that provides a modern Web UI for administration.

For e.g. #Mailcow the problem is different. It is kinda easy to setup, but it hides how it works so well that people get started without understanding how to deal with things like SPF, DKIM, DMARC, ...

In fact it also adds a lot of other unnecessary things to worry about ontop which makes beginners think it is such a big thing to do that they give up and just go with google mail.

Mailcow is not a email server. the same way MS Exchange isn't. It's groupware. The focus is different.

MailCow в проде — запуск, настройка. Она вам не «Корова»

В прошлой статье мы рассказали, почему решили съехать с корпоративной почты Mail.Ru на свою инфраструктуру. Тогда мы обошлись без деталей — а зря, судя по комментариям. В этот раз разбираем всё по шагам: как разворачивали MailCow и какие нюансы есть. Эта статья — техническое продолжение. Без макроэкономики, только руки, консоль и шишки. P.S. в прошлой статье сообщество решило, что у нас работает школьник и все это настраивает, поэтому статья как раз написана с помощью этого школьного товарища. Не судите строго, все таки мы еще в школу ходим :) Доить "Корову"

https://habr.com/ru/articles/1072920/

#mailcow #selfhosted #saasoft

🚀 New #release · Mailcow 2026-07b

This release updates Redis, SOGo and ClamAV, addressing multiple security issues.
What's Changed
• [Redis] Update to 7.4.10 by @FreddleSpl0it in #7425
• [Clamd] Update to 1.4.6 by @FreddleSpl0it in #7415
• [SOGo] Update to 5.12.10 by @FreddleSpl0it in #7422

Full release notes & setup → https://selfhost.directory/project/mailcow#update-11540065

#homelabbing #mailcow #proxy #opensource #security

Is there truth in the claims in this 2023 article? If so, we really should be recommending people not use Outlook if they care about the privacy of their emails.

https://www.heise.de/en/news/Microsoft-lays-hands-on-login-data-Beware-of-the-new-Outlook-9608798.html

It's linked to in the mailcow instructions:

https://docs.mailcow.email/client/client-outlook/

#digitallysovereign #digitalsovereignty #mailcow #email

So, it seems to come down to a choice of two:
#mailcow - completely open source, but many many docker containers which I absolutely despise.
#stalwart - One binary, does everything, open source and Enterprise and sufficiently not US based to matter.
Tried setting each up. mailcow - took about an hour of fiddling, tweaking and double-checking DNS records. stalwart - took ten minutes and did the lot.
Even for the Enterprise version, the licence is ridiculously cheap ($2/mailbox/year).

@autkin

Not really — they are independent projects, not a fork.

The visual similarity is likely because both use Material for #MkDocs, a static-site-generator/documentation theme, rather than sharing a codebase.

docker-mailserver is a separate, configuration-file-based containerized mail stack; #mailcow is a broader multi-container suite with its own admin UI and integrated groupware components.

#Mailserver #SelfHosting #Docker

Have just stumbled upon https://docker-mailserver.github.io . The website looks very similar to #Mailcow . Is this a fork? #mailserver #selfHosting

Хватит строить Kubernetes для пятнадцати человек

Я много лет занимался инфраструктурой. Потом перестал и ушёл в продукт — но привычка заглядывать: «А как у вас тут всё устроено?» осталась. И вот теперь я хожу к клиентам по совсем другим вопросам, а глаза всё равно выпадают.

https://habr.com/ru/articles/1069238/

#authentik #mailcow #nextcloud #planka #selfhosted #sso #oidc #docker #итинфраструктура_малого_бизнеса #keycloak

Deploy a Self-Hosted #SMTP Relay with #Mailcow on #Ubuntu #VPS (10 Minute Quick-Start Guide) This article provides a guide to deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS.

When you deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS, you can manage email delivery securely and efficiently. This guide walks you through installing and configuring Mailcow for SMTP relaying. ...
Continued 👉 https://blog.radwebhosting.com/deploy-a-self-hosted-smtp-relay-with-mailcow-on-ubuntu-vps/?utm_source=mastodon&utm_medium=social&utm_campaign=mastodon.raddemo.host #mailserver #selfhosted #selfhosting #mailrelay #opensource

Mise à jour importante de sécurité Mailcow 2026-07a

https://friendica.mesnumeriques.fr/display/3a8d2dbf-146a-719d-512b-786145450700

Mise à jour importante de sécurité Mailcow 2026-07a

D'habitude je ne poste pas les notifications de mises à jour de Mailcow, mais je le ferai à partir de maintenant quand cela implique des patchs de sécurité.

Source : https://github.com/mailcow/mailcow-dockerized/releases/tag/2026-07a

🏖️🐮 Mooly 2026 | Postfix 3.10.12, Rspamd 4.1.0 & Nginx 1.30.3 - Révision A (Dernière version)

Changements Importants :

Cette mise à jour corrige plusieurs problèmes de sécurité dans mailcow. Nous vous recommandons vivement de mettre à jour votre instance mailcow dès que possible.

Mises à jour et sécurité :

- [Rspamd] mise à jour vers la version 4.1.4
- Correction de la CVE-2026-42533 pour Nginx
- Mise à jour de l'action `actions/stale` vers la version v11
- Renforcement de la sécurité de mailcow

Corrections :

- fix : restauration de l'affichage de l'objet dans l'aperçu de la quarantaine
- [Nginx] liaison IPv6 uniquement pour `default_server` si `ENABLE_IPV6` est activé
- [Web] correction : `add/time_limited_alias` ignorait silencieusement les requêtes et la validité
- [Web] renvoi de `sender_acl` dans l'API `get/mailbox`
- fix : validation des paramètres d'origines autorisées CORS
- [Web] renforcement de la correspondance des origines CORS et ajout de `Vary: Origin`
- [Web] déplacement de la vérification de mise à jour de mailcow côté serveur
- [Web] création d'un modèle de boîte aux lettres par défaut avec accès EAS et DAV
- [ACME] saut de la demande de certificat MTA-STS si MTA-STS n'est pas activé pour un domaine

#autohebergement #mailcow #email #privacy #mesnumeriquesfr #selfhosted #souverainetenumerique

Deploy a Self-Hosted #SMTP Relay with #Mailcow on #Ubuntu #VPS (10 Minute Quick-Start Guide) This article provides a guide to deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS.



When you deploy a ...
Continued 👉 #selfhosting #mailrelay #selfhosted #mailserver #opensource

Deploy a Self-Hosted SMTP Rela...

#aliasvault sieht mit nach einem Upgrade zu #bitwarden / #vaultwarden aus. Das schaue ich mir die nächsten Tage mal an. Bisher lief mein Alias Management immer manuell und ziemlich umstänich ab über meinen Account bei meinem #mailcow Server.

Ich habe hier eine Reihe von #Roundcube Addressbüchern, Signaturen etc, die ich gerne nach #Mailcow umziehen würde. Hat das schon mal wer gemacht?

@IzzyOnDroid they have also repeatedly and consistently flagged mailcow instances, a FOSS stack to selfhost email #mailcow @doncow

🚀 New #release · Mailcow 2026-07a

What's Changed
Important
This update addresses several security-related issues in mailcow. We strongly recommend updating your mailcow instance as soon as possible.
Updates and Security
• [Rspamd] update to 4.1.4 by @FreddleSpl0it in #7386

Dig into this release → https://selfhost.directory/project/mailcow#update-7981078

#homelabbing #mailcow #opensource #proxy #security

Viele Funktionen nutzte ich in der Nextcloud ja nicht. Deshalb habe ich mich ja für andere Wege entschieden. Cryptomator und Joplin mit einem S3 Speicher, Kalender und Kontakte nutze ich mit Mailcow.

Jetzt bekam ich vor kurzem auf der Arbeit eine Datei zugeschickt. Zu groß für das Postfach, also per Link um diese bei swissfiles in den nächsten 30 Tagen herunterzuladen. Die eine oder andere Datei hatte ich auch hin und wieder per Nextcloud geteilt. Dies fällt ja aber nun auch weg. Also musste eine Lösung her: Pingvin.

Abgesichert mit Authelia als OIDC und die Registrierung deaktiviert, weil ich ja nicht will, das Gott und die Welt unbekannte Dateien über meinen Server verbreitet. Das kann ja mal schnell nach hinten losgehen. Fehlte nur noch ein Virenscanner, falls ich mal einen Link erstelle, über den andere User auch Dateien für mich hochladen können.

Für mich immer noch sinnvoller als eine Nextcloud zu betreiben und zu warten.

#pingvin #selfhosting #nextcloud #mailcow #authelia #cryptomator #joplin #s3 #bucket #alternativen #swissfiles

Deploy a Self-Hosted #SMTP Relay with #Mailcow on #Ubuntu #VPS (10 Minute Quick-Start Guide) This article provides a guide to deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS.



When you deploy a ...
Continued 👉 #mailrelay #mailserver #opensource #selfhosting #selfhosted

Deploy a Self-Hosted SMTP Rela...

Deploy a Self-Hosted #SMTP Relay with #Mailcow on #Ubuntu #VPS (10 Minute Quick-Start Guide) This article provides a guide to deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS.

When you deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS, you can manage email delivery securely and efficiently. This guide walks you through installing and configuring Mailcow for SMTP relaying. ...
Continued 👉 https://blog.radwebhosting.com/deploy-a-self-hosted-smtp-relay-with-mailcow-on-ubuntu-vps/?utm_source=mastodon&utm_medium=social&utm_campaign=mastodon.raddemo.host #mailrelay #opensource #selfhosting #selfhosted #mailserver

Deploy a Self-Hosted #SMTP Relay with #Mailcow on #Ubuntu #VPS (10 Minute Quick-Start Guide) This article provides a guide to deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS.



When you deploy a ...
Continued 👉 #selfhosting #selfhosted #opensource #mailrelay #mailserver

Deploy a Self-Hosted SMTP Rela...

Deploy a Self-Hosted #SMTP Relay with #Mailcow on #Ubuntu #VPS (10 Minute Quick-Start Guide) This article provides a guide to deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS.

When you deploy a self-hosted SMTP relay with Mailcow on Ubuntu VPS, you can manage email delivery securely and efficiently. This guide walks you through installing and configuring Mailcow for SMTP relaying. ...
Continued 👉 https://blog.radwebhosting.com/deploy-a-self-hosted-smtp-relay-with-mailcow-on-ubuntu-vps/?utm_source=mastodon&utm_medium=social&utm_campaign=mastodon.raddemo.host #mailserver #mailrelay #opensource #selfhosting #selfhosted

for those running #mailcow, what are some symbols that you've adjusted that made the biggest impact? I'm pretty good at blocking spam, but getting some ham mixed in with spam. Thanks!

#mail #selfhosted #spam #homelab #boost

@karsbehr Oh, etwa selbst gehostet? #mailcow kann ich empfehlen, läuft hier in der Family seit Jahren wunderbar. Aber klar: Für Laien natürlich eher nicht praktikabel, leider.