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What mail server installation covers
A complete mail server is several programs working together. The MTA (mail transfer agent) accepts and delivers mail between servers. A mailbox server stores messages and serves them over IMAP. A filter scores incoming mail for spam and malware. Webmail gives users a browser interface. Around them sit TLS certificates, DNS records and the authentication that lets users log in and send securely.
Installation means getting all of those pieces to agree with each other. This page is about the full two-way stack; if you only need outbound sending, see SMTP server setup.
When a full installation makes sense
- You want company mailboxes on infrastructure you control, rather than on a per-seat hosted suite.
- You need mail data kept on a server in a particular location for internal or client reasons.
- You run applications that need to receive mail, such as ticketing or bounce processing, as well as send it.
- An existing server was set up years ago, nobody remembers how, and a clean rebuild is safer than patching it.
Self-hosting mailboxes is real responsibility: backups, updates and spam filtering become yours. We explain that trade-off honestly before starting.
We also look at who will look after the server day to day. A small team with no Linux experience is usually better served by an integrated suite with a clear admin panel than by a hand-assembled stack, even if the hand-built option is more flexible on paper.
The components we install
| Layer | Typical choice | Purpose |
|---|---|---|
| MTA | Postfix | Sends and receives mail between servers |
| Mailbox / IMAP | Dovecot | Stores mail and serves it to clients |
| Filtering | Rspamd | Scores spam, checks authentication, signs DKIM |
| Webmail | SOGo or Roundcube | Browser access to mail, calendars and contacts |
| TLS | Let’s Encrypt certificates | Encrypts SMTP, IMAP and webmail |
Where an integrated suite suits better, we deploy Mailcow, which packages Postfix, Dovecot, Rspamd and SOGo with an admin interface. The right choice depends on how many mailboxes you have, who will administer it and how much customisation you need.
How the installation runs
- Server checks: outbound port 25 open, reverse DNS settable, IP addresses not already on major blocklists.
- Base hardening: operating system updates, firewall, SSH key access, brute-force protection.
- Stack install and configuration of each component, with sensible limits on message size and connection rates.
- DNS: MX, SPF, DKIM, DMARC, PTR and autodiscover records published and verified from several resolvers.
- TLS: certificates issued, automatic renewal confirmed, and every port tested externally.
- Two-way testing: mail sent to and received from Gmail, Outlook and Yahoo, with headers inspected for authentication results.
- Backups configured and a restore tested, not just scheduled.
- Documentation and handover.
Standards and security
Inbound mail is checked against SPF, DKIM and DMARC. Outbound mail is signed and aligned so your own messages pass the same checks elsewhere. Where it adds value we publish MTA-STS so other servers insist on encrypted delivery to you, and TLS-RPT so you receive reports when that fails. Submission requires authentication over TLS, and the server is tested to confirm it is not an open relay.
If the server will send newsletters or campaigns, the same rules apply as anywhere: opt-in recipients only, a working unsubscribe, and awareness of CAN-SPAM, GDPR and India’s DPDP Act where they apply.
What affects timeline and cost
- Number of domains and mailboxes.
- Whether webmail, calendars and contacts are needed.
- Migration of existing mailboxes and how much mail they hold.
- Backup requirements and retention period.
- Your hosting provider’s process for port 25 and PTR changes.
Mistakes that cause trouble later
Common problems include certificates that expire because renewal was never tested, backups that exist but have never been restored, a hostname that doesn’t match reverse DNS, and spam filtering left at defaults that either lets junk through or quarantines genuine mail. We test each of these before we call the job finished.
Related: DNS configuration, SSL and TLS configuration, all email infrastructure services and our complete guide. Get in touch to plan your installation.
Frequently asked questions
Do you install on our existing server?
We can, if it meets the requirements and isn’t already running conflicting services. A clean server is usually faster and easier to document.
Can we keep using Outlook or phone mail apps?
Yes. Standard IMAP and SMTP submission work with desktop and mobile clients, and we set up autodiscover records where they help clients configure themselves.
Who handles updates after installation?
Security updates can be automated, and we document the manual tasks. If you prefer, our monitoring and maintenance service covers ongoing care.
Can you migrate our existing mailboxes?
Yes. Mailboxes are copied with an overlap period so nothing is lost, and DNS is switched once the new server is confirmed working.
How is spam filtering handled on incoming mail?
Incoming mail is scored by the filter using authentication results, reputation data and content checks. We tune the thresholds after handover based on what actually arrives, so genuine mail isn’t quarantined.
Talk to us about mail server installation
The full sending and receiving stack installed and configured from a bare server.