Switch SMTP provider without rewriting your app.
You change the server, port, username and password. Your emails leave from our EU servers, DKIM-signed with your domain.
- 14 days free, €0 today
- Then from €12.90/month + VAT (annual plan)
- Servers and data in the EU
relay.mailsenpai.com2525 · STARTTLSyour-username••••••••••••It’s four details
You change them in the .env file, in your software’s settings panel or in the plugin. Nothing else.
relay.mailsenpai.comThe same for every app.
2525With STARTTLS: the connection is encrypted.
from your areaYou’ll find it in your area as soon as you start the trial.
from your areaPut it only in your app’s settings, never in the code.
# .env · change only these lines SMTP_HOST=relay.mailsenpai.com SMTP_PORT=2525 SMTP_USER=your-username SMTP_PASS=from-your-area Test email sent · result in the log
SMTP_HOST=relay.mailsenpai.com SMTP_PORT=2525 SMTP_USER=your-username SMTP_PASS=from-your-area
# or via the API, with your key POST /relay/v1/invio Authorization: Bearer msp_… Send accepted · result in the log
Test it without switching off your current provider
Until you change the 4 details, your sending stays where it is.
- 1€0 today
Start the trial
14 days. We ask for your billing details and a card.
- 2SPF and DKIM
Verify your domain
We give you the DNS records to publish, and we check them for you.
- 3whenever you like
Move one app
Send a test email and see the result in the sending log.
Start with a single app. The others stay where they are.
Prices and terms side by side
Public data only: entry price, what happens beyond your volume, where your data is kept.
| Service | For about 10,000 emails a month | Beyond the included volume | Data in the EU |
|---|---|---|---|
| SMTP Senpaiour service | €12.90/month for 10,000 emails on the annual plan (excl. VAT). Before that, a 14-day trial at €0. | Your choice: sending stops with no charges, or you carry on in blocks of 1,000 emails up to the spending cap you set. We let you know before you reach the limit. | Yes: servers and data in the European Union. |
| SendGrid (Twilio)pricing · EU data · full comparison | No 10,000-email plan: the Essentials plan starts at $19.95/month for 50,000 emails. | The pricing page states that overage charges may apply. | EU data residency on the Pro and Premier plans (Pro from $89.95/month). |
| Mailgun (Sinch)pricing and EU region · full comparison | Basic plan: $15/month for 10,000 emails. | Extra emails from $1.80 per 1,000. | You can choose to send from, and keep your data in, the EU region. |
| Amazon SESpricing · regions · full comparison | Pay as you go: $0.16 per 1,000 emails on the Essentials plan (the starting plan for new accounts) or $0.10 at the à la carte rate. About $1-1.60 per 10,000 emails. | No included volume: you pay for every email you send. | EU regions are available, for example Frankfurt and Ireland. |
| Brevopricing · plans · EU data · full comparison (in Italian) | Starter plan with 10,000 emails: €14.00/month, €12.67/month on the annual plan. The volume covers both newsletters and automated emails. | You can add prepaid email credits or move to a higher plan. | Yes: servers in France and Germany, data on Google Cloud in Belgium. |
Prices as of October 2026. They may change: the provider’s own page, linked under each name, is the reference.
We tell you what to fix
No suspension for crossing a threshold: we alert you first, with the details.
Alert from the teamAn address is bouncing: we’ve excluded it from future sends. The details are in Monday’s report.
An alert comes first
If bounced or reported emails go up, we write to tell you what to check. We don’t suspend the service for crossing a threshold.
Bounces excluded automatically
If an address rejects your email or reports it as spam, it won’t receive future sends.
Log and report
Every send with its result for 90 days: delivered (accepted by the recipient’s server) or rejected. Plus a report every Monday.
Real people, two languages
Support from real people in English and Italian. Servers and data in the EU.
Frequently asked questions
Do I need to rewrite my code?
No. In the software you already use, enter 4 details: server relay.mailsenpai.com, port 2525 with STARTTLS, username and password. If you prefer, there’s an API with a key. In your area you’ll find ready-made examples for PHP, WordPress and the command line.
Can I test it without switching off my current provider?
Yes. Until you change the 4 details, your sending stays where it is: you can connect a test environment or a single app first, and move the rest when you’re ready. Your SPF record can include both services.
I use an API today, not SMTP. What do I do?
Two options: switch to SMTP, which almost every language and framework supports, or use our API: POST /relay/v1/invio with your msp_ key in the Authorization: Bearer header. Via the API you can also read statistics, events and excluded addresses.
Why do you need a card if the trial is free?
It keeps out people who send spam, which would damage everyone’s reputation. We charge nothing today and we email you 3 days before the trial ends. If you cancel from your area before it ends, you pay nothing.
Where do the comparison prices come from?
From each provider’s official pricing page: the link is under each name. We took the smallest plan that covers about 10,000 emails a month, in the currency shown on that page. Brevo also counts newsletters in the same volume. We don’t compare deliverability or service quality: they aren’t publicly verifiable data. Prices change often, so the provider’s page is always the reference.
More useful pages
Four details to change. Everything else stays as it is.
- 14 days free, €0 today
- Cancel anytime from your area
- Support from real people in English and Italian
€0 todayTry it free