How to Explain Deliverability Problems to Clients Without Losing Trust

The moment you realize a client's inboxes have a deliverability problem, you have two tasks: fix the problem and manage the client relationship. Most agency operators are strong at the first and weak at the second. Here's how to handle both.

Timing: diagnose before you communicate

Don't call the client the moment you detect an issue. Spend 30–60 minutes running diagnostics first. Know whether you're dealing with a fixable technical issue (DKIM broke) or reputation damage (domain burned). The conversation is completely different for each.

A fixable technical issue that you solve before the client notices isn't an incident — it's proactive maintenance. You might never need to tell them. A reputation issue that requires campaign pausing is an incident that requires clear communication.

What clients actually care about

Clients don't care about DKIM selectors or RBL listings. They care about:

Is my campaign still running?
Am I still getting meetings?
Will this affect my results this month?
Is this my fault?
What are you going to do about it?

Your communication should answer these questions clearly, in plain language, before they ask them.

The communication framework

Initial notification (within 2 hours of detection)

Short, factual, with a clear timeline for full update:

"Hi [Client], we've identified a technical issue affecting email deliverability on your campaign. We're diagnosing it now and will have a full update and resolution plan to you within 2 hours. Sends are paused on the affected accounts while we assess. I'll reach out as soon as we know more."

Technical summary (within 24 hours)

This should cover: what happened, what you're doing, campaign impact, and next steps. Key principles:

Take ownership, don't make excuses
Give a plain-English explanation of the technical cause
Be specific about impact (which campaigns, what timeframe)
Be specific about resolution (what you're doing and by when)
If the campaign is continuing on backup infrastructure, lead with that

Template for auth/technical issue

"We identified that a DKIM authentication record for your sending domain stopped working on [date] — this is a technical configuration issue that can happen after email provider updates. As a result, emails sent between [date] and [date] may have had reduced inbox placement. We've fixed the record, verified the fix is working, and campaign sends have resumed. I'm attaching a technical summary for your records. No action needed from you."

Template for reputation damage / infrastructure replacement

"We identified that the sending domain [domain] has developed a deliverability issue related to its reputation with email providers. This can happen as a result of aggressive sending patterns over time. We've moved your campaign to a fresh set of sending accounts, which are already running. The affected domain is going through a recovery process that will take 4–6 weeks. Your campaign continuity is not impacted. I'm scheduling a call to walk you through what we're doing and what we're changing to prevent this going forward."

What not to say

Don't say "your inboxes are burned" without context — it sounds irreversible
Don't blame the email provider, your ESP, or external factors exclusively
Don't promise specific recovery timelines you can't guarantee
Don't give more technical detail than they need — it creates more questions than answers

After resolution: the prevention conversation

Once the issue is resolved, have a brief call covering:

What caused the issue
What you've changed to reduce the risk going forward
What monitoring you've added
What backup capacity you now maintain

This conversation is actually an opportunity to demonstrate sophistication and professionalism. Clients who see that you have a serious response process and post-incident review are more likely to trust you with larger campaigns, not less.