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About Mission Inbox Mission Inbox is a B2B email infrastructure platform processing 80M+ emails per month for 130+ customers globally; including enterprise accounts paying us $240K+ per year. We're cash-flow…
A senior systems engineer will own and scale Mission Inbox's email transmission infrastructure: maintaining MTAs (Postfix, Postal, Dovecot), load balancing and failover (HAProxy, FRRouting, PostgreSQL replicas), enforcing SPF/DKIM/DMARC authentication, running anti-abuse defenses (Rspamd, Fail2Ban), and monitoring deliverability to protect IP and domain reputation.
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