Email Deliverability.

Email Deliverability, properly understood

Deliverability is emails that land in the inbox divided by emails sent — distinct from open rate, which measures what happens after delivery. It's driven by sender reputation (domain and IP history), authentication (SPF, DKIM, and DMARC records configured correctly), list hygiene (bounce rate, spam complaint rate, recipient engagement), and content signals like spammy phrasing or an excessive link-to-text ratio. ESP delivery reports plus inbox-placement seed-list testing are the usual measurement tools, since the ESP can't always see what happens after handoff to the receiving mail server.

Many Gulf-based brands send from young or recently migrated domains without properly warming them up, which tanks deliverability regardless of content quality. Regional ISPs and mobile carriers can filter spam differently than the major providers most deliverability advice is written around, so testing inbox placement against the audience's actual email providers matters more than it seems. WhatsApp has displaced email as the primary channel for many Gulf consumer brands, but for businesses still running it — B2B, subscription, loyalty programs — a bilingual send with a heavy image-to-text ratio in the Arabic version is a common, avoidable spam trigger.

A raw 'sent' number tells you nothing on its own — high volume with poor authentication just means more emails silently routed to spam or blocked outright. Buying or scraping lists, instead of building consent-based ones, is the fastest way to spike spam complaints and get a domain blacklisted. A single bad send from a new domain can damage sender reputation for weeks, dragging down even well-crafted future campaigns, and open-rate tracking itself has gotten less reliable since Apple Mail Privacy Protection pre-fetches images regardless of true deliverability.

Read deliverability alongside bounce rate, spam complaint rate, sender reputation score (from tools like Google Postmaster Tools), and eventual click-through or conversion — deliverability is the gate everything else has to pass through first.

Segmenting the list by engagement tier before every send — active openers/clickers, dormant-but-valid, long-unengaged — protects sender reputation far more than sending everyone the same campaign every time; mailbox providers increasingly judge a domain by how recipients treat its mail in aggregate, so repeatedly emailing a large dormant segment that never opens quietly drags the whole domain's reputation down. Running a short re-permission campaign to reconfirm interest from long-unengaged subscribers, then suppressing whoever doesn't respond, is usually cheaper in the long run than protecting list size at the expense of deliverability for the segment that still opens.