"Infrastructure region" sounds like a detail you shouldn't have to think about. For a transactional email platform sending to Indian recipients, it actually matters for two separate reasons: physical proximity, and legal jurisdiction. They're easy to conflate, so it's worth separating them.
Latency: proximity, not magic
Network latency roughly tracks physical distance and the number of hops in between. An API call from a server in Mumbai to AWS SES in the same region (ap-south-1) travels a much shorter path than the same call routed to a US or Singapore data center and back. The same logic applies on the delivery side: SES handing a message to an Indian recipient's mail server from inside India involves fewer network hops than handing it off from another continent.
We won't cite a specific millisecond figure here without a proper field-measured benchmark to back it up -- if you're evaluating this for a latency-sensitive use case, measure your own actual round-trip time against whatever provider you're considering, rather than trusting anyone's marketing number, including ours.
Compliance: what the DPDP Act actually requires
It's a common assumption that Indian data protection law requires all personal data to be stored inside India. That's not quite what the Digital Personal Data Protection Act, 2023 (DPDP Act) says: it doesn't impose a blanket data-localization mandate for all personal data. Instead, it gives the central government the power to restrict transfers of personal data to specific countries it notifies (a blacklist approach, not a default requirement to keep everything in India). Sector-specific rules elsewhere -- notably the RBI's 2018 circular requiring payment system data to be stored only in India -- are a separate, narrower requirement that predates the DPDP Act and applies specifically to payment data, not email.
So choosing India-based sending infrastructure isn't about satisfying a specific DPDP Act clause that doesn't exist in that blanket form. What it does do is remove an entire category of cross-border-transfer questions before they come up, and it lines up with the data-residency expectations many Indian enterprise customers, auditors, and procurement teams already have baked into their own vendor checklists — independent of whether the law strictly requires it.
This is general information, not legal advice. Talk to counsel about your specific compliance obligations under the DPDP Act and any sector-specific rules that apply to your business.
What MailKaka actually does here
MailKaka sends and receives email through Amazon SES in the Mumbai region (ap-south-1), and stores attachments in S3 in the same region. That claim is specifically about the email-sending infrastructure -- it's the part that matters for the latency and data-residency reasoning above.