Reach the inbox at scale — Mailpro® SMTP sending servers.
Send large newsletter volumes through optimized, monitored SMTP servers with automatic retries, domain authentication and Swiss hosting — so your campaigns land reliably instead of being throttled or blocked by your own server.
Infrastructure proven at scale
Professional routing, without the server headaches
Instead of pushing large volumes through your own mail server — where you get throttled or blocked — Mailpro relays your campaign through infrastructure built for the job.
You send, we relay
Your newsletter is handed to Mailpro's routing layer, which selects the best path across the network to your recipients — no port 25 limits on your side.
Authenticated & monitored
Mail is signed with SPF, DKIM and DMARC, sent from high-reputation IPs so inbox providers trust it.
Retried until delivered
If a recipient's server is briefly unavailable, we resend at intervals, and bounces are managed automatically so your lists stay clean.
Everything behind reliable delivery
The SMTP server is one part of a complete deliverability and routing stack. Explore each piece:
Dedicated IP
Full control of your own sending reputation for high, steady volumes.
Dedicated IP pool
We manage reputation across a set of IPs matched to your sending quality.
IP reputation management
Reputable IPs keep you out of the spam folder and in front of customers.
Mail Transfer Agent (MTA)
The mail exchanger that moves your messages between servers.
Swiss data center
Your data hosted in Switzerland for strong privacy and GDPR alignment.
SPF configuration
Authorize Mailpro to send for your domain with one DNS line.
DKIM configuration
Cryptographically sign every message so providers trust it.
DMARC record
Tell inbox providers what to do when a check fails — and block spoofing.
Anti-spam checker
Test your content's spam score before you send.
More than a sending server
By sending through Mailpro®, routing your newsletters is safe, fast and secure — and the same platform handles everything around the send. You can schedule your sending for the ideal moment, automate mailings based on triggers, customize the sender email address, and personalize each message with dynamic fields.
Want the technical background? Read what an SMTP relay is, the difference between port 465 and port 587, the 10 factors to verify before choosing an SMTP server, or our full guide to email deliverability.
Frequently asked questions
What is an SMTP relay?
How much can I send through Mailpro's SMTP server?
What if an email returns an SMTP error?
Do I need to configure SPF, DKIM and DMARC?
Where are Mailpro's servers hosted?
Ready to send from infrastructure built to deliver?
Start free in minutes — no credit card. Route your campaigns through Mailpro's optimized SMTP servers and watch your inbox placement improve.