Learn · Channels & deliverability
One platform, every channel.
A customer-engagement platform is the system that reaches your customers across every channel — email, SMS, web push, and in-app — and keeps those messages landing. This track explains the channels, how they work together instead of in silos, and the deliverability and consent rules that decide whether a message is seen at all.
In this guide
- 01What is a customer-engagement platform (CEP)?A customer-engagement platform is software that manages customer profiles and events and reaches people across multiple channels — email, SMS, web push, in-app — from one place. It differs from an email service provider, which only sends email, and a customer data platform, which unifies data but does not send.Read
- 02Email deliverability for startupsDeliverability is whether your email reaches the inbox instead of the spam folder or a hard block. Three things drive it: authentication that proves you are who you say, sender reputation built over time, and list hygiene that keeps your audience engaged. Get those right and the inbox follows.Read
- 03SPF, DKIM, and DMARC explainedSPF, DKIM, and DMARC are three DNS-based email authentication standards: SPF lists which servers may send for your domain, DKIM signs each message so tampering shows, and DMARC ties both to your visible From: domain and tells receivers what to do when they fail. Together they prove a message is really from you.Read
- 04How to warm up an email domainWarming up an email domain means ramping your send volume gradually — starting low and climbing over a few weeks — so mailbox providers build trust in a new sender before you mail at full volume. A new domain has no reputation, so a sudden blast gets throttled or filtered. Warmup earns that reputation.Read
- 05Multi-channel vs omnichannelMulti-channel means using several channels that each run on their own; omnichannel means those channels are coordinated around one customer view, so timing, messaging, and suppression carry across them. The difference is coordination, not the number of channels you send from.Read
- 06SMS marketing basicsSMS marketing is sending promotional or lifecycle text messages to people who explicitly opted in. In the US it is governed by the TCPA and by carrier A2P 10DLC registration. Get consent, register your traffic, honor STOP, and reserve SMS for time-sensitive moments where its cost and intrusion are justified.Read
- 07Web push and in-app messagingWeb push notifications reach a user's device or browser even when they are off your site, after an explicit opt-in, while in-app messages appear only while the user is active inside your product. Different reach, different consent, and different jobs to be done.Read
- 08Journey orchestration across channelsJourney orchestration is coordinating messages across channels and time as one flow — deciding the next best step per person with branches, waits, wait-for-event, A/B splits, and cross-channel suppression, rather than firing each channel independently. It treats email, SMS, push, and in-app as one conversation, not separate campaigns.Read
- 09Transactional vs marketing emailA transactional email is triggered by a user action and carries information they need — a receipt, a password reset, a shipping update — while a marketing email promotes and requires consent plus an unsubscribe link. They differ in three ways: what triggers them, whether consent is needed, and which rules apply.Read
- 10How to switch email platformsTo switch email platforms, export everything before you cancel anything, carry your suppression list to the new tool, re-permission where consent doesn't transfer, and warm up the new sending domain gradually. Your data moves in an afternoon. Your sender reputation does not — that is the part that needs a plan.Read
- 11Cold email vs lifecycle emailCold email and lifecycle email are different disciplines separated by one thing: consent. Cold email is unsolicited outreach to strangers who never asked to hear from you — sales prospecting. Lifecycle email goes to people who opted in and is triggered by what they do. They differ on law, tooling, and sending reputation.Read
Related comparisons
- fromHello vs Customer.ioThe open-source alternative that brings the team, not just the tool.
- fromHello vs BrazeEnterprise-grade orchestration without the enterprise contract — or the team to run it.
- fromHello vs BrevoBrevo's cheap toolkit, plus native ad-audience sync, open-source ownership, and the eight specialists who run growth.
- fromHello vs KlaviyoKlaviyo's channels for any small team — not just ecommerce — plus the eight specialists who run growth.
- fromHello vs MailchimpThe growth engine you graduate to after the newsletter — every channel, run by eight specialists, self-hostable.
- fromHello vs IterableEnterprise cross-channel orchestration — without the sales cycle, the annual contract, or the growth org to run it.
- fromHello vs OrttoOrtto's breadth, but with the eight specialists who run growth and open-source ownership — your data, not Canva's.
- fromHello vs OneSignalOneSignal's channels, run for you by eight specialists — plus ad-audience sync and open-source self-hosting.
- fromHello vs NovuNovu is the notification infrastructure; fromHello is the growth team that decides what to send.
- fromHello vs LoopsLoops' clean email, plus every other channel and the eight specialists who run growth — open source, self-hostable.
- fromHello vs ActiveCampaignA deep automation builder, plus the eight specialists who design and run it — open source, self-hostable.
- fromHello vs ApolloApollo does outbound sales; fromHello does lifecycle growth for the audience you already have. Different ends of the funnel.
- fromHello vs InstantlyInstantly is cold email at scale; fromHello is lifecycle growth for the audience you already have. Different jobs.
- fromHello vs LemlistLemlist does cold outreach; fromHello does lifecycle growth for the audience you already have. Opposite ends of the relationship.
- fromHello vs ClayClay enriches GTM data; fromHello runs lifecycle growth for the audience you have. Different jobs — Clay can even feed it.
- fromHello vs OutreachOutreach is enterprise sales engagement; fromHello is lifecycle growth for the customers you already have.
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