Powermta Configuration Guide Top Better -

file. Replace default IP addresses with your server's actual IP and update all domain instances to match your sending domain. Authentication

| Problem | Likely Cause | Solution | |---------|--------------|----------| | 450 4.7.1 Service unavailable | You hit ISP rate limit | Lower max-msg-rate for that domain | | Emails queued, not sending | No reverse DNS for your source IP | Configure rDNS with your ISP | | DKIM fails | Wrong selector or private key path | Test with pmta test-dkim --domain example.com | | High deferrals | No SPF on sending domain | Add v=spf1 ip4:YOUR_IP ~all to DNS | powermta configuration guide top

# Syntax: domain-key <selector>,<domain>,<private-key-file> domain-key s1,client-b.com,/etc/pmta/dkim/client-b.key powermta configuration guide top