Most Indian apps already know how to send email over SMTP. Frameworks ship with it, hosts expose it, and every language has a mail library that speaks it. What changes is what's on the other end of the connection: a reliable relay that actually gets your mail into the inbox.
A credential swap, not a migration
The reason teams reach for SMTP first is integration time. You're not writing new code, you're changing host, port, username, and password. Submission ports 587 and 465 work from any Indian VM or shared host, which matters because plenty of Indian providers block port 25 outbound by default. Once the credentials are in your config, nothing else in your app has to move.
SMTP alone isn't deliverability
A bare SMTP relay delivers what you hand it. If your reputation starts slipping, that's your problem to fix. Our SMTP service runs through the same reputation engine the rest of the platform uses: it watches bounce and complaint signals continuously and throttles sending speed per domain in real time, so a single bad day on one domain never drags the rest of your mail into spam. That's the part that turns "the mail sent" into "the mail arrived."
India sending basics
- Submission ports 587 and 465, so it works from Indian hosts that block port 25
- Billed in INR through Razorpay
- GST-compliant invoices on every payment, for input-tax-credit
- Support inside Indian working hours
When to use SMTP vs the API
Use SMTP when you already have working mail code and just want to point it at a better relay. Use the API when you want structured event webhooks, templated sends, or tighter control over individual messages. Both ride the same sending and reputation stack, so the choice is about your integration shape, not deliverability.
Audit before you switch
Whichever relay you move to, inbox placement starts at DNS. The free deliverability check audits your SPF, DKIM, DMARC, and MX in seconds, no signup, so you migrate with authentication correct.
Common questions
What is an SMTP service?
It's a server that accepts your outbound email over the SMTP protocol and delivers it to recipients. Your app authenticates with credentials, hands off the message, and the SMTP service handles the rest: routing, retries, bounce processing, reputation. Most apps and frameworks already speak SMTP, so pointing them at a relay is usually just a credential change.
SMTP relay or REST API — which should I use for India sending?
Use SMTP relay when your app or framework already sends mail (most do) and you just want to swap credentials. Use the REST API when you're writing new code and want structured JSON, predictable responses, and webhooks for every event. Both run on the same infrastructure here, so deliverability is identical. SMTP wins on speed-to-integration, API wins on event visibility.
Will SMTP work from my Indian server or app?
Yes. SMTP is a standard protocol and works over the public internet from any server, including India-hosted VMs and shared hosts. The only thing to watch is some Indian hosting providers blocking outbound port 25 by default. We support submission ports 587 and 465, which they typically allow.
Does an SMTP service handle deliverability for me?
It can, but not all do. A barebones relay just delivers what you hand it and leaves bounces and reputation as your problem. sendmsg.io's SMTP service includes the reputation engine: it watches bounces and complaints and adjusts sending speed per domain in real time, so a problem on one domain doesn't drag the rest into spam.
Related
- Email API India: the REST view of the same stack
- Transactional Email Service India: for OTPs, receipts, order mail
- What is SMTP relay: the protocol explained
- Email Reputation Management: the layer that protects inbox placement