Guides

In-depth guides on business email infrastructure — deliverability, DNS, authentication, and migration. Written by the Droppoint team.

The Complete Guide to Email Deliverability for Businesses

"Deliverability" is whether your email actually reaches the inbox — not just whether it sends without an error. A message can send successfully and still land in spam, be silently dropped, or get delayed for hours. This guide covers the main levers that determine which of those happens.

Start with authentication

The three DNS-based records — SPF, DKIM and DMARC — are the foundation. Without them, receiving mail servers have no reliable way to confirm mail claiming to be from your domain is legitimate, which pushes it toward spam by default on many providers.

• SPF (Sender Policy Framework) lists which servers may send for your domain.
• DKIM (DomainKeys Identified Mail) cryptographically signs each message.
• DMARC ties the two together and tells receivers what to do on failure.

Getting these three right is table stakes — most deliverability problems trace back to one being missing or misconfigured.

Sending reputation

Beyond authentication, receiving providers track the reputation of your sending IP and domain over time: complaint rates, bounce rates, spam-trap hits, and consistency of sending volume all factor in.

List hygiene

Sending to addresses that bounce, no longer exist, or never engage drags reputation down. Remove hard bounces immediately, and periodically prune addresses that haven't opened or clicked anything in a long time.

Content signals

Spam filters also look at message content: excessive links, spammy phrasing, mismatched display name vs actual address, and image-heavy emails with little text can all raise flags — though authentication and reputation matter more than any single content rule.

Monitor, don't set-and-forget

DMARC reports tell you which sources are sending as your domain and whether they're passing authentication — review them periodically, especially after adding a new sending tool.

Check your current setup

Run through our Domain Health Checker for a broad first pass, then the specific free tools for anything flagged. Or let Droppoint configure all of this correctly from the start.

DNS Records Explained for Business Email

Setting up business email means touching your domain's DNS (Domain Name System) — the system that maps human-readable domain names to the technical details of where mail and websites actually live. Here's what each relevant record type does.

MX (Mail Exchange)

Tells the internet which server(s) receive mail for your domain, with a priority number (lower is tried first).

TXT records for authentication

SPF, DKIM and DMARC are all published as TXT records — plain text entries that can hold arbitrary data.

• SPF lives at your domain's root TXT record.
• DKIM lives at {selector}._domainkey.yourdomain.com.
• DMARC lives at _dmarc.yourdomain.com.

A / AAAA and CNAME — not mail records

A (IPv4) and AAAA (IPv6) records point a hostname at a server's address; CNAME points one hostname to another. These control your website, not your mail routing.

NS (Nameserver)

Declares which nameservers are authoritative for your domain — i.e. where all these other records actually live and get edited.

TTL — why changes aren't instant

Every record has a TTL (time to live) — how long other servers are allowed to cache it before re-checking. It's common practice to lower TTL shortly before a planned change and raise it again afterward.

Putting it together for a migration

A typical business email setup or migration touches: one MX record, one SPF TXT record, one DKIM TXT record per active sending source, and one DMARC TXT record. See our Email Migration page for how this fits into a full cutover plan.