Email Validation Services: What They Can and Cannot Do
Validation APIs verify syntax, domains, and mailbox existence. Where each check works, where catch-alls and traps defeat them, and where validation belongs in your stack.
Articles and tutorials on communication infrastructure.
25–36 of 61 articles
Validation APIs verify syntax, domains, and mailbox existence. Where each check works, where catch-alls and traps defeat them, and where validation belongs in your stack.
Warmup services exchange automated opens and replies between member accounts to simulate engagement. Why providers treat this as manipulation and what to do instead.
Seed lists promise a number for the question every sender asks: inbox or spam folder? What placement tests measure, where they systematically mislead, and how to use them.
Every include, a, mx, and redirect in your SPF record costs a DNS lookup, and the budget is ten. Why records break at scale and how to fix them without flattening regret.
Every delivery question has its answer in the headers. How to trace a message's path through Received lines and decode Authentication-Results like a postmaster.
Microsoft now requires SPF, DKIM, and DMARC from high-volume senders to Outlook consumer domains. What the rules demand, how enforcement works, and how to comply.
Spam filters do not detect AI authorship. They detect what careless AI usage produces: template sameness, volume spikes, and engagement decline. Where the real risks are.
The NIS2 directive makes email authentication and transport security a regulatory matter for thousands of EU organizations. What it requires and where email fits.
Switching email providers resets your IPs, your DKIM keys, and every provider assumption about your traffic. A migration plan that carries your reputation across.
TLS-RPT delivers daily JSON reports on every failed TLS negotiation to your domain. The record, the report format, and how to turn failures into fixes.
MTA-STS closes the STARTTLS downgrade hole by letting domains require verified TLS for inbound mail. The policy file, the DNS record, and the gotchas in between.
RUA reports arrive as gzipped XML that nobody reads by hand. The report anatomy, a working parsing pipeline, and how to interpret the sources you will find.