Why 'Just following up' fails
The reason 'just following up' has the lowest open rate of any business email subject is that it announces the email contains no new information. The reader's inbox is a triage system: any email that signals 'this is going to repeat what I already ignored' loses to one that signals 'this is going to add something useful.' The fix is to make every follow-up subject line carry a new payload, even a small one.
The four payload patterns that work
1. Net-new information
'2 new examples from your sector' is a genuine reason to re-engage. So is 'a comparison your CFO will want' or 'the chart I forgot to send Friday.' The subject line is doing the work of justifying the second touch.
2. Specific reference to the prior thread
Anchoring the follow-up to a concrete detail from the original conversation — a name, a number, a date — signals continuity and re-activates the prior context in the reader's mind. 'the 30-day pilot you mentioned' is doing more work than 'following up on our chat.'
3. The polite breakup
'closing the loop' or 'last note from me' counterintuitively gets high open rates because it implies the reader is being let off the hook. The body should genuinely release them; using this pattern to push another pitch destroys trust fast.
4. The single question
Sometimes the cleanest follow-up subject is just the question you want answered. 'still the right time to revisit?' or 'is this dead?' (used sparingly) get replies because the answer feels like a single word.
Cadence: how many follow-ups, how far apart
For cold sales sequences, four to six touches over three to four weeks is the modern norm. Spacing matters more than count — three follow-ups in five days reads as desperate; three over three weeks reads as persistent. For warm follow-ups (post-meeting, post-intro), two follow-ups over ten days is usually the right cadence. After that, ask once more in a month rather than bumping the same thread.
Subject lines for each follow-up scenario
After a meeting
Lead with the most useful artifact of the call — a doc, a number, a next step. 'the 3 things we decided' beats 'follow-up from our call.'
After a no-reply on a cold email
Change the subject line entirely on every follow-up. Same subject across a sequence is the strongest 'this is a templated sales sequence' signal an inbox classifier sees.
After a delayed response
Don't shame them. 'still useful?' or 'happy to drop this if the timing is off' work better than 'haven't heard back.'