Business Email Infrastructure & Deliverability
Built and operated a self-hosted business email platform with SMTP/IMAP services, mailbox administration, webmail, domain authentication, spam filtering and real-world deliverability testing.
- Client
- Business Email Platform
- Industry
- Business Communications
Challenge
The goal was to operate business email as a controlled production service rather than depend entirely on a third-party mailbox provider. That meant solving several layers together: reliable SMTP delivery, IMAP mailbox access, user and domain management, browser-based mail access, spam filtering, DNS authentication and operational troubleshooting. Deliverability also had to be assessed against real external providers rather than judged only by whether a message left the server.
Approach
We designed the mail platform as a set of separate but integrated responsibilities. Postfix handles message transfer, Dovecot provides mailbox and IMAP services, and Rspamd provides filtering and reputation-related controls. Application services manage mailbox identities, organization-level administration and the web experience, while Nginx and TLS provide the public service edge. For each mail domain, DNS authentication was configured and validated using SPF, DKIM and DMARC. SMTP and IMAP behavior was tested from real clients, and outbound delivery was checked against major external mailbox providers so that spam placement, authentication and reputation issues could be investigated with actual delivery evidence.
What We Delivered
• Production SMTP and IMAP mail services. • Secure mailbox access for desktop, mobile and third-party mail clients. • Browser-based PostBox webmail experience. • Organization and mailbox administration through the management portal. • Custom-domain and mailbox identity provisioning. • SPF, DKIM and DMARC configuration and validation. • TLS-protected public mail endpoints. • Rspamd-based spam filtering and mail-policy controls. • Deliverability testing against major external mailbox providers. • Operational logging and troubleshooting for failed, delayed or filtered messages.
Ongoing Support
Mail infrastructure requires continuing operational attention, so the platform is maintained as a live service rather than a one-time deployment. Ongoing work includes reviewing delivery behavior, adjusting anti-spam rules, validating DNS records, monitoring service health, investigating authentication or mailbox issues and rolling frontend/backend improvements into the production platform.
Services, products and platforms used in the engagement.
Services
Products
Technologies
A complete self-hosted business email environment is operating with authenticated custom-domain mail, webmail, mailbox administration, IMAP/SMTP compatibility and a real deliverability-testing process instead of relying only on configuration assumptions.
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