SMTP (Generic) + CRM
The universal path. If you're on a provider that isn't one of our four native integrations (Resend, Postmark, Amazon SES, SendGrid), use generic SMTP. Trade-off: no webhook-based event tracking (SMTP doesn't have that), but unlocks every email-sending service in existence. Reliable, boring, works.
What you can do with SMTP (Generic) + Sambandh
Use cases that drive real results for your business.
Niche email provider compatibility
Mailgun, Brevo (formerly Sendinblue), MailerSend, Fastmail SMTP — dozens of viable email providers don't have dedicated Sambandh drivers. SMTP catches them all.
Self-hosted email servers
Running your own Postfix or Exim server for compliance/control reasons? Point SMTP credentials at it. Sambandh sends campaigns through your infra end-to-end.
ISP / hosting-provided SMTP
Google Workspace SMTP, Zoho Mail SMTP, Microsoft 365 SMTP. For low-volume sends (< 2,000/day) these built-in SMTP options work without adding a third-party provider.
Provider migration bridge
In the middle of moving providers? Use SMTP with your old provider's credentials to keep sending while you warm up the new one. Switch to a native driver once migration is complete.
Why teams choose Sambandh for SMTP (Generic)
How to connect SMTP (Generic) to Sambandh
Set up in under two minutes. No engineering help needed.
Get SMTP credentials from your provider
Mailgun: control panel → domains → SMTP credentials. Brevo: SMTP & API → SMTP. Fastmail: settings → password & security → app passwords. The fields you need: host, port, username, password.
Paste into Sambandh Settings → Email → BYOK
Pick SMTP from the provider dropdown. Enter host (e.g., smtp.mailgun.org), port (587 for STARTTLS, 465 for TLS), username, password. Toggle "secure" if using port 465. Hit Test connection.
Verify sender domain DNS
Most SMTP providers require the sending domain to have DKIM + SPF records pointing at their infrastructure. Follow your provider's domain-verification guide. Without it, your sends will land in spam.
Send a test campaign
Create a campaign, send a test to yourself, verify inbox placement (not spam). If spam, the issue is almost always DKIM / SPF — fix at your provider, retest.
Frequently asked questions
Common questions about the SMTP (Generic) integration.
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