Why it happens
Double emailing is rarely one rep being careless. It usually comes from one of three gaps, and most teams have at least two of them.
Shared lists
Someone exports a list for an event, a campaign or a new territory, and it gets passed round. Two reps load overlapping slices into their sequences. Neither knows the other has the same names, and nothing stops them.
No ownership rules
If nobody has written down who owns a Lead, a Contact or an Account, reps reasonably assume anyone can email anyone. Inbound Leads, former customers and new people at existing accounts are the usual grey areas.
Sequences that aren't visible in the CRM
If sequences run in a separate tool, or straight from personal inboxes, Salesforce can show a Lead as untouched while someone is two emails into a sequence. The second rep checks the record, sees nothing, and starts their own.
The fixes
1. Write down ownership rules
Keep them short enough that people remember them. For example:
- The Lead or Contact owner in Salesforce is the only person who sequences them.
- People at an Account with an open Opportunity belong to that Opportunity's owner.
- Existing customers are emailed by their account manager, not the new business team.
- Anyone wanting to reach someone a colleague owns asks first, in an agreed place.
Then make Salesforce match the rules: assignment rules for inbound Leads, a clear owner on every Account, and a regular tidy-up of records still owned by people who have left.
2. Make activity visible
Rules only work if people can see what's happening. Every email, call and sequence should show on the record in Salesforce, whichever tool sent it. A rep opening a Lead should be able to tell within seconds whether anyone has been in touch this month. If you want to see how much is slipping through, our guide to finding the leads going cold is a good place to start.
3. Check before enrolment
The most reliable fix is a check at the moment someone is added to a sequence, rather than a rule people have to remember. Before anyone is enrolled, four questions:
- Are they already in an active sequence?
- Are they owned by someone else?
- Have they opted out?
- Are they at a domain nobody should be emailing?
If the answer to any of them is yes, skip that person and say why, so the rep isn't left guessing. You can do this by hand, comparing each new list with a report of everyone currently in a sequence, but it's slow and easy to skip on a busy day. It works best when the tool does it every time.
4. Handle opt-outs in one place
When someone asks not to be contacted, it has to apply to the whole team, not just the rep who got the reply. Record it on the Salesforce record, where everyone can see it, and make sure every sending tool checks it. Keep a domain blocklist too, for customers, partners and anyone else who shouldn't be prospected.
How a CRM-native tool can help
When sequences live in Salesforce as records, the check before enrolment gets much simpler. The tool can look at the person's record, see whether they're already in an active sequence and decline a second one. The record of who is in which sequence is the same record everyone else is looking at, so there's no second system to reconcile.
How Overdrive Engage handles it
Overdrive Engage runs inside Salesforce, with campaigns, steps and every email stored as Salesforce records on the Lead or Contact. Its conflict check allows one active sequence per person across the whole team, so if a colleague already has someone in a live sequence, that person is skipped rather than emailed twice.
It respects opt-outs and a domain blocklist, sends from each rep's own Gmail or Outlook, and stops a sequence as soon as the person replies.
If you'd like to see it on your own data, there's a free 30-day trial with no card needed. Starter is £49 ($59) per seat a month, with no limit on contacts and no per-email charge.