1. Domain & Email Settings
SPF TXT Record
Standard TXT@
v=spf1 include:_spf.google.com ~all
DKIM CNAME Record
Standard CNAMEsynxmail.ins1._domainkey.example.com
dkim.synxmail.in
DMARC TXT Record
Standard TXT_dmarc.example.com
v=DMARC1; p=none; rua=mailto:[email protected]
Tired of Email Deliverability Bottlenecks?
Setting up sending servers, domain alignment, and SPF records can be tedious. SynxWeb engineers high-performance SMTP relays and transaction pipelines that ensure critical notifications land directly in the inbox.
Explore SynxWeb Email API →Understanding Email Authentication: SPF, DKIM, and DMARC
To prevent spam and spoofing, modern receiving servers (like Google Gmail, Microsoft Outlook, and Yahoo) require domains sending transactional alerts to pass rigorous authentication audits. If your SPF, DKIM, or DMARC alignments are misconfigured, your system notifications—such as OTPs, order invoices, and account confirmations—will be routed directly to the spam folder.
Sender Policy Framework (SPF)
An SPF record is a TXT record stored in your domain's DNS settings. It specifies exactly which servers and IP blocks are allowed to send mail on behalf of your domain. Having multiple SPF records violates RFC standards and causes immediate authentication failure. You must combine all sources into a single TXT record, as demonstrated in our configurator.
DomainKeys Identified Mail (DKIM)
DKIM adds a cryptographic signature to email headers. This signature is verified using a public key published in your domain's DNS. DKIM guarantees that the email's content was not tampered with in transit. SynxWeb recommends using 2048-bit DKIM keys to ensure maximum security standards.
DMARC Alignment
DMARC ties SPF and DKIM together. It instructs recipient systems how to handle messages that fail authentication. Start with a monitoring policy (p=none) to collect XML aggregate reports (via the rua tag) to trace all sending servers. Once verified, elevate the security policy to p=quarantine or p=reject to eliminate brand impersonation.
1. Message Blueprint Details
SynxWeb Verified
Official Business AccountWhatsApp Cloud API JSON Payload
JSON RequestWant to Deploy Verified Campaign Templates?
We integrate and verify company profiles directly with Meta's developer suite, configuring secure Webhook endpoints, interactive carousels, and quick-reply triggers.
Integrate WhatsApp Business Gateway →Structuring Messages for the WhatsApp Business Cloud API
Unlike traditional peer-to-peer texting, companies sending outbound WhatsApp messages must use pre-approved **Message Templates**. These templates ensure messages conform to Meta's user policies and keep spam levels low. Our template mock utility simplifies this process by demonstrating how variables map to actual developer payloads.
Template Component Architecture
A WhatsApp template contains three primary structural blocks:
- Header: Optional title banner. Supports static text (max 60 chars) or media links (images, PDFs, or videos).
- Body: The core text content. Supports formatting (*bold*, _italics_, ~strikethrough~) and dynamic placeholder parameters (e.g.
{{1}},{{2}}). - Footer: Small grey baseline text. Ideal for compliance statements, brand taglines, or opt-out notices.
Interactive Buttons & CTAs
Adding button components increases click-through rates by up to **40%**. Meta supports two types of interactive buttons:
- Quick Reply: Send predefined text answers back to the chat (e.g., "Confirm Order", "Opt Out"). Best for automated bot trees.
- Call to Action: Triggers phone dials or launches website links. Links can be dynamic, appending a coupon or tracking ID to the redirect path.
1. Logistics Stops Simulation
Click anywhere inside the grid canvas on the right to place delivery coordinate stops, or select a preset dataset below to simulate routing optimization.
Live Coordination Canvas
SynxWeb Routing Matrix Request
POST payloadNeed Multi-Vehicle Routing Optimization at Scale?
Our production routing systems solve complex multi-depot vehicle fleet tours (VRP), accounting for time windows, capacity limits, and traffic-adjusted isochrones in milliseconds.
View Routing Engine API →Solving Last-Mile Delivery Bottlenecks: TSP and VRP Engines
For physical distribution networks, retail logistics, and courier services, dispatch layout ineffeciences drive up fuel consumption and operations overheads. Computing optimized delivery orders client-side or server-side is key to automating scheduling. The simulation above solves the **Traveling Salesman Problem (TSP)** on Cartesian coordinates, generating a single optimized route.
Algorithmic Complexity & Scale
Brute-force calculations evaluate all possible path permutations, meaning complexity grows at O(n!). For 10 delivery locations, there are over 3.6 million combinations; for 15 locations, it jumps to 1.3 trillion. To scale operations, developers deploy heuristics like Nearest Neighbor, local searching (2-Opt), and genetic models to yield near-optimal tours in milliseconds.
Distance Matrix Computation
To run a routing search, a distance-time matrix is computed first. The matrix evaluates distance and travel time between every node in the delivery network. SynxWeb's Routing Engine API uses Contraction Hierarchies to calculate a 100x100 matrix grid (10,000 route computations) in under 80 milliseconds.
Real-World Constraints (VRP)
Production logistics require solving the Vehicle Routing Problem (VRP) rather than just single-route TSP. VRP maps multiple vehicles simultaneously while managing complex constraints like vehicle volumetric capacities, driver working shifts, delivery time-windows, and dynamic traffic adjustments.
1. SMS Text & Variables
Volume Cost Calculator
SMS Engine Metrics
GSM-7 (Standard)SYNWEB
Transactional SMSPHP DLT-Compliant SMS Integration
PHP cURLUnderstanding DLT Regulations & SMS Part Calculus
In India, the Telecom Regulatory Authority of India (TRAI) mandates that all commercial text messages are verified against Distributed Ledger Technology (DLT) blockchain databases prior to transmission. A single character discrepancy between your API payload and your approved DLT template will trigger a delivery failure. Additionally, message length calculations change depending on your character encoding.
GSM-7 vs. Unicode Encoding
GSM-7 is the standard alphabet for SMS, containing English letters, digits, and basic punctuation. Standard English text uses GSM-7. However, if your message includes a single Unicode character (such as Hindi, Arabic, or emojis), the entire message encoding switches to UCS-2 (Unicode).
- GSM-7 Limits: 160 characters for a single SMS. Multi-part messages allow 153 characters per part.
- Unicode Limits: 70 characters for a single SMS. Multi-part messages allow 67 characters per part.
DLT Template Binding Guidelines
When sending SMS via the API, you must explicitly pass your approved Entity ID (Principal Entity ID) and Template ID. Dynamic placeholders must be formatted exactly as {#var#} in your templates. When calling the API, you populate those variables with actual values (e.g. order numbers or names) while ensuring the rest of the text matches the approved template layout exactly.
1. Customer Phone & Pre-filled Message
+91 98765 43210
OnlineNeed Automations and Official Meta APIs?
Direct chat links are great for personal connections. But for enterprise marketing, customer support bots, and dynamic templates, you need SynxWeb WhatsApp Business API gateways.
Explore WhatsApp Cloud API →Leveraging WhatsApp Click-to-Chat (wa.me) Links and QR Codes
WhatsApp's **Click-to-Chat** feature allows users to start a conversation with someone without having their phone number saved in their phone's address book. By generating clean wa.me short URLs and displaying them online or converting them into physical print QR codes, you lower user friction, resulting in **up to 3x higher mobile conversion rates** compared to static contact forms.
How wa.me Links Function
Click-to-chat links use the official format https://wa.me/<number>, where the number is a full phone number in international format, excluding any leading zeroes, brackets, plus signs, or dashes. If you want to include a pre-filled message that automatically populates the user's text field, the text is URL-encoded and appended as a ?text= query parameter.
Offline Marketing with QR Codes
QR codes are ideal for print ads, brochures, product packaging, shop fronts, and business cards. When scanned by any smartphone camera, they immediately redirect the user to the native WhatsApp app with your support or sales window open, initiating instant communication workflows.