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SMTP Relay Setup: Configure Your Sending Infrastructure for Maximum Deliverability
A technical guide to setting up SMTP relay — authentication, bounce handling, and monitoring.
What is SMTP relay and when to use it
SMTP relay routes outbound emails through a server with established IP reputation. Use it when sending more than 500 emails per day or when your server IP has poor reputation.
SpaceCRM SMTP: Host smtp.spacecrm.net, Port 587 (TLS) or 465 (SSL), Username: your API key.
Configuration and authentication
Update your domain SPF record to include SpaceCRM's sending servers. Enable DKIM signing in SpaceCRM domain settings. Both are required for full authentication.
Most email clients and frameworks support these settings with no modifications. Integration takes under 15 minutes.
Bounce management
Connect a webhook to receive delivery events: delivered, bounced, complained, unsubscribed. Process hard bounces immediately — do not retry.
A complaint rate above 0.1% is a warning. Above 0.3% triggers sending limits. Review weekly in SpaceCRM's deliverability dashboard.
