Selzy: Email marketing platform
Selzy is an Email marketing platform founded in 2013, headquartered in Cyprus. Pricing: Free · paid from €5.25/mo. It targets marketing senders willing to hand transactional traffic to UniOne, the relay run by the same company. Our verdict: Fastest onboarding of any platform reviewed here. Watch for: A 4.8 Capterra score built on a three-month review burst. Rated 6.3/10 overall across ease of use, deliverability, and pricing value.
What is Selzy?
Selzy and the SMTP relay UniOne are run by the same Cypriot company, ECOMZ Holding Limited, registered as HE 309897 since July 2012 — ten years before the Selzy brand existed. Calling it a rebrand of UniSender is wrong: a separate Russian company took over unisender.com in April 2022, and that brand still trades there.
Selzy runs no mail server of its own, and its own transactional page sends readers to UniOne. Its API is RPC over GET, method name in the path and key in the query string, and its contract promises 99% uptime measured across a year, where UniOne promises the same 99% per billing month.
Explore Selzy on SMTPedia
Frequently asked questions
Is Selzy worth it in 2026?
Our full editorial review covers pricing, deliverability, ease of use, support quality, and API/MCP maturity. Read the Selzy review →
How much does Selzy cost?
All pricing tiers, hidden fees, refund policy, and the true cost per email are broken down in the pricing tab. See Selzy pricing →
What are the best alternatives to Selzy?
Selzy compared with its closest competitors by use case, pricing, and switching cost. See alternatives →
What are the SMTP settings for Selzy?
Hostnames, ports, authentication, rate limits, and DKIM/SPF configuration for Selzy. See SMTP settings →
Does Selzy have an official MCP server?
Our API tab covers Selzy's REST API version, SDKs, rate limits, and MCP server support (official, community, and commercial wrappers). See API + MCP →
This review follows our email infrastructure testing methodology. We disclose affiliate relationships in our editorial independence policy.
