Email Deliverability for B2B Manufacturers: Why Your Follow-Ups Aren’t Landing
A quote follow-up sequence with a good open rate six months ago and a poor one now usually hasn’t gotten worse content, it’s gotten worse delivery. Inbox providers have tightened requirements significantly in the last few years, and a manufacturer sending from a domain that hasn’t kept up with those requirements can do everything else right and still land in spam. The direct answer: deliverability problems are almost always one of three things: missing or misconfigured authentication records, a sending reputation damaged by list hygiene, or a mismatch between what a domain is authorized to send and what’s actually going out.
The Three Authentication Records That Now Function as a Baseline
SPF (Sender Policy Framework) is a published record that tells receiving mail servers which servers are allowed to send email on a domain’s behalf. Without it, a receiving server has no way to confirm a message claiming to be from your domain actually came from an authorized source, which is treated as suspicious by default.
DKIM (DomainKeys Identified Mail) adds a digital signature to outgoing mail that lets the receiving server verify the message wasn’t altered in transit and genuinely originated from the claimed domain. It’s a tamper check and an identity confirmation in one record.
DMARC (Domain-based Message Authentication, Reporting & Conformance) sits on top of both, telling receiving servers what to do with a message that fails SPF or DKIM checks (reject it, quarantine it, or let it through) and giving the sending domain reporting on failures. As of major 2024 requirement changes from Google and Yahoo, both SPF and DKIM plus a basic DMARC record are now required, not optional, for any business sending meaningful volume, and messages from domains missing them face rejection or automatic spam routing.
Any manufacturer whose email marketing or sales-sequence platform was set up more than a couple of years ago, without anyone specifically revisiting these three records since, should assume they need a check. That’s a five-minute technical audit for whoever manages the domain’s DNS, and it is very often the actual cause of a “why are our emails not landing anymore” problem that gets misdiagnosed as a content or subject-line issue.
Why Sending From a Free or Generic Address Makes This Worse
Sending sales or marketing email from a generic address, or from a domain not properly configured for bulk sending, compounds authentication problems, since major providers now specifically require sending from a domain you control and have properly authenticated, not a shared consumer domain. A manufacturer’s sales team sending high volumes of manual follow-up from individual @gmail.com-style addresses, thinking it looks more personal, is often working against its own deliverability without realizing the mechanism.
Why List Hygiene Is a Deliverability Issue, Not Just a Data Issue
Inbox providers track engagement and complaint signals per sending domain, not just per message. A list full of dead addresses, old bounced contacts, and disengaged recipients drags down the sending domain’s overall reputation, which then affects delivery even to recipients who would otherwise open and engage. This is the same underlying problem covered in CRM hygiene automation: a CRM full of untagged, dormant contacts doesn’t just waste a sales rep’s time, it actively damages the sending reputation every time a campaign goes out to that stale list. Keeping the spam complaint rate under roughly 0.1 percent, the threshold major providers now enforce, generally requires active list hygiene, not just good content.
What to Actually Check, In Order
First, confirm SPF, DKIM, and a basic DMARC record are all correctly published for the sending domain, not just configured once years ago and never revisited as sending platforms or volume changed. Second, confirm sales and marketing email is going out from a properly authenticated domain, not a generic or personal address. Third, review list hygiene: how old is the contact list, how many addresses have bounced or gone dormant, and is there an active process for removing or suppressing them, similar to the dormancy flagging covered in the CRM hygiene piece above.
Common Questions
Can bad deliverability be fixed quickly, or does it take time to recover? Fixing the authentication records themselves can happen within a day, but sending domain reputation with inbox providers rebuilds gradually, so a full recovery from a genuinely damaged reputation typically takes weeks of consistent, clean sending rather than showing up immediately.
Does this apply to individual sales follow-up emails, or only bulk marketing sends? Both. Inbox providers evaluate sending domain reputation across all mail from that domain, so a sales team’s manual follow-up emails and a marketing platform’s bulk sends both draw on, and both affect, the same underlying domain reputation.
Who should actually check SPF, DKIM, and DMARC for our domain? Whoever manages your DNS records, typically an IT contact, web developer, or hosting provider, can check and update these records directly; most modern email platforms also provide a records checker or setup guide specific to their own sending requirements.
For how this connects to the broader picture of automation that actually helps, see the complete guide to practical AI and automation for manufacturers.
If your follow-up sequences have stopped converting and nobody’s caught why yet, Schedule a Discovery Call.