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