Email migration with deliverability that actually improved.

A B2B SaaS company had moved off SendGrid twice before — both times deliverability had degraded and they’d moved back. We did it a third time, with proper IP warming and deliverability monitoring, and got deliverability that matched SendGrid by week three and beat it by month two.

INDUSTRY

B2B SaaS

DOMAIN

MIGRATION

DELIVERED

2023

STACK

AMAZON SES·DEDICATED IPs·EASY DKIM·SES EVENT DESTINATIONS·CLOUDWATCH METRICS

RESULTS

What changed, by the numbers.

EMAIL BILL

−68%

$11K → $3.5K / MONTH

INBOX RATE (GMAIL)

99.1%

WAS 97.3% ON SENDGRID

IP WARMING

STRUCTURED RAMP

BOUNCE/COMPLAINT MONITORING

AUTO

EVENTBRIDGE TO SLACK

HOW IT WENT

The previous SES attempts had failed because of cold-IP deliverability — new IPs lack the sending reputation that established services have. Both times the team had sent at full volume immediately and watched their inbox rate collapse.

This attempt ran a structured six-week IP warming: gradual volume ramp on dedicated IPs, careful audience segmentation (engaged subscribers only in the warming phase), continuous monitoring of bounce and complaint rates. SES Event Destinations fed bounce data into EventBridge for real-time visibility.

Bill dropped 68%. Gmail inbox rate is at 99.1% — ahead of where it had been on SendGrid (97.3%). The structured warming was the difference. The third attempt was the charm.

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