What server logs are critical to pull during a deliverability audit?

Essential logs for deliverability audits:

SMTP transaction logs:

Connection attempts and results

Server responses (codes and messages)

Timing information

Bounce logs:

Bounce codes and messages

Timestamp and recipient

Sending context

Authentication logs:

DKIM signing events

SPF lookup results

Any errors or failures

Connection logs:

TLS negotiation

IP addresses used

Connection timeouts or failures

ESP-specific logs:

Event webhooks

Delivery status notifications

Engagement events

Comprehensive logs enable accurate diagnosis.

Ship logs, port records, and cargo manifests together tell the complete story.