Cold Email & Outreach

How to Set Up Custom SMTP for Cold Email Campaigns (SES, Postmark & Gmail)

Priya Sharma
Priya Sharma
Lead Deliverability & Outreach Specialist
October 10, 2026 8 min read
TL;DR / Quick Summary

Configuring custom SMTP gives you complete sovereignty over your sending IP reputation and eliminates shared sender pool penalties associated with third-party mailers.

Why Custom SMTP Outperforms Shared Mail Pools

Shared mail pool providers group dozens of senders on common IPs. When another sender spam-blasts bad lists, your deliverability suffers. Custom SMTP keeps your sender reputation 100% isolated.

Frequently Asked Questions

Does Olonyn support Google Workspace App Passwords?
Yes! You can connect standard Gmail App Passwords, Outlook OAuth, Amazon SES, or custom SMTP servers in 30 seconds.
Priya Sharma
Written by Priya Sharma
Lead Deliverability & Outreach Specialist
Specializes in cold email inbox placement, SPF/DKIM/DMARC server infrastructure, and anti-spam deliverability algorithms.
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