How to Self-Host a Production-Grade Mail Server with Mailcow
Every major mailbox provider charges a recurring fee to do something you can run yourself on hardware you fully control.
By using Mailcow Dockerized, you can package a complete email stack—SMTP, IMAP, webmail, antivirus, and antispam—into a single deployment. But if you want to avoid the spam folder, you need to run it on a dedicated server, not a shared VPS.
Here is exactly what you need to know before you start deploying. 👇
Why a Dedicated Server?
On a shared VPS, you inherit the bad IP reputation of other tenants, and spam waves will drain your CPU. A dedicated server gives you:
A clean, dedicated IP address.
Zero resource contention.
Full control over your Reverse DNS (PTR) records.
The DNS Deliverability Checklist đź“ť
Your server can be perfect, but if your DNS is wrong, your mail goes to spam. Make sure you configure:
MX: Routes your mail.
SPF: Authorizes your server's IP.
DKIM: Cryptographically signs outgoing mail.
DMARC: Handles mail that fails SPF/DKIM.
PTR (Reverse DNS): Confirms your IP resolves back to your hostname.
Server Minimum Requirements ⚙️
RAM: 6–8 GB is the realistic floor for a production mailbox running ClamAV (Antivirus) and SOGo webmail together.
OS: Debian 11/12 or Ubuntu 22.04 LTS
Docker: Latest stable engine.
Crucial Step: Confirm with your host that outbound port 25 is open. If it's blocked, your server cannot send emails!
Ready to deploy?
If you want the complete step-by-step installation commands, firewall hardening tips, and backup automation scripts, check out the full guide on my website here
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How to Set Up Your Own Self-Hosted Open-Source Secure (Access) Email Server with Mailcow
 A truly secure email server can’t access your conversations, can’t profile you, won’t show you targeted ads, and won’t log any data or metadata. You can set up your own mail server using Mailcow, which has a nice modern web interface, and a calendar function.
 Yes hosting it yourself will be a bit more initial setup effort including creating a hosting environment (home IP addresses are often blocked by commercial mail providers - it does provide DKIM and ARC support though), and domain name, and the Mailcow installation. The management and interface though are a lot more functional and modern looking than you get with typical self-hosting solutions such as Roundcube, Rainloop, etc.
 From what I see though, the security is centred around login access and hosting privacy, as I don't see anything relating to encrypted mail. The problem with encrypted mail though is all your recipients also need to be using the same encryption, otherwise they cannot read it. Truly encrypted mail, with something like PGP encryption, is available with Thunderbird mail as even with 3rd party add-ons in GMail.
 See https://lifehacker.com/how-to-set-up-your-own-secure-email-server-1848026797
 #technology #privacy #email #mailcow #opensource #selfhosting
 https://lifehacker.com/how-to-set-up-your-own-secure-email-server-1848026797
Mailcow: Set up mail server and operate with low spam
Mailcow: Set up mail server and operate with low spam
Mailcow: Set up mail server and operate with low spam
Software setup
Filter configuration and spam
Conclusion
Read article in c’t 10/2021
The own mail server for the family, the sports club or the company is a declaration of independence: no mail provider or web host is then responsible for mails ending up in the mailbox. No spam filter that you cannot control yourself will accidentally…
