Insights & practical guides

Pasting 800 addresses into BCC is where most email marketing disasters begin. Sending caps, the Gmail / Yahoo / Microsoft bulk sender rules, the 0.3% complaint threshold, and why sender reputation can only be built slowly.

Why manage EDM, SMS, and WhatsApp on one platform? Unified suppression, cross-channel reporting, drip marketing, and Hong Kong compliance (UEMO, unsubscribe) in practice.

Evaluating Twilio alternatives or a Hong Kong Fintech SMS gateway? API selection for brokerages and banks: deliverability, DLR, routing, compliance, # Sender ID, and reconcilable submit volume.

Compare international messaging APIs for delivery rates in Hong Kong? Test design, DLR reconciliation, grey-route detection, and multi-country compliance — with a practical checklist.

MMS travels over a data connection and bills per message, so it fails in ways SMS never does. How MMS charging actually works, six reasons a message never arrives, and the two ways a business can send it — dashboard or API — with the real spec limits.

How do OTP bombing and SMS pumping (AIT) work? Prelude 2025: 11.83% of verification requests fraudulent. Rate limits, number-range monitoring, route separation, and six UFOSEND-ready controls.

SMS vs MMS vs WhatsApp: OTP, marketing, support, cost, and compliance in one view. When Hong Kong businesses use which channel, shared suppression lists, and conversion tracking.

Use teams to separate business units, departments and agencies inside one account so each only sees its own lists and campaigns, then optionally add a maker-checker step where operators submit and reviewers approve. Five roles, the isolation rules, and four worked scenarios.

What is SMS: 短訊 (Hong Kong) and 簡訊 (Taiwan) are the same service. 160 / 70 character billing, OTP use cases, # Sender ID and Taiwan white-listing. Businesses: SMS API docs and apply for a +886 test key.

WhatsApp API Hong Kong on the official Cloud API: how to apply, template review, the 24-hour window, OTP and when to use SMS. Meta verification handled — see the WhatsApp service page.

Turn an FAQ sheet into a WhatsApp customer service bot: merge duplicate questions, build three-level list menus, add the same three buttons after every answer, collect the order number before handing off, and stay within Meta's interactive message limits.

"Submitted" is not "delivered". A breakdown of the two-tier SMS reporting model, what every status code means, and how UNDELIV, EXPIRED and REJECTD should each be handled.

What a grey route is, how to spot one, and what it actually costs you in deliverability, sender name integrity, DLR honesty and regulatory exposure. With four tests you can run yourself.

A registered Hong Kong SMS sender name is shown with a leading #, and only organisations registered with OFCA get it. Naming rules, documents, why applications are returned, and the IS code when the name is not on your account. Taiwan SMS does not use this # name.

OTP looks like "send a number". Expiry, resend windows, rate limiting, route separation and AIT fraud defence all bite when they are wrong. The six we see most often in production integrations.