https://sudonull.com/email-technical-basics-of-smtp-imap-for-developers
Learn how SMTP and IMAP protocols work, Inbox Zero methods and correspondence optimization for IT specialists. Read a detailed analysis.
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https://sudonull.com/postfix-dkim-docker-send-only-server-setup
Step-by-step guide to deploying Postfix with DKIM in Docker on Ubuntu. Authorization, TLS, SPF. Deliverability testing. For middle/senior devs. Start deploying your own mailer without relay services.
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