Bump message

What is a bump message?

A bump message (also called a bump email, thread bump, or inbox bump) is a very short follow-up — typically one sentence — sent as a reply to an existing unanswered email thread to re-surface it in the prospect's inbox. The classic form: reply to the original thread with just 'Bumping this up in case it got buried.' The prior email is visible in the thread below; the bump is just the re-surfacing mechanism.

The logic behind the bump: inbox volume means even interested prospects let email threads slip. A prospect who opened the first email, found it interesting, and genuinely intended to reply may have simply forgotten. A bump re-surfaces the thread at a different moment — perhaps when they're not mid-task — and often converts the interested-but-silent prospect into a reply.

The bump differs from a standard follow-up email in intent and length. A follow-up adds new content: a different angle, a new proof point, a specific question. A bump adds almost nothing — it's purely a re-surface mechanism. Use bumps when the prior email was strong and the prospect just needs the thread visible again. Use full follow-ups when the prior email didn't land and a new angle is needed.

Types of bump messages

Bump messages fall into three categories based on what the re-surface adds to the thread.

• Pure bump — no new content. 'Bumping this up in case it got buried.' One sentence. Best used 3–5 days after a well-performing first email that got opens but no reply. The prospect saw it and was interested; the bump is just a reminder.
• Signal bump — re-surface with a new hook. 'Bumping this — saw [Company] just announced [news]. Makes what I mentioned more relevant.' Adds fresh context to justify the re-surface without requiring the rep to write a new email.
• Question bump — add a direct, minimal-effort question. 'Bumping this — is there a better person on your team to connect with about this?' or 'One quick question: is the timing off, or is [topic] not on the radar?' Low-stakes reply path.

Best practices for bump messages

1. Send as a reply to the original thread, not a new email. The forwarded thread is the context. A bump that starts a fresh email thread loses the connection to the original message.

2. Keep it under two sentences. Any longer and it becomes a follow-up email, not a bump. The bump's value is its brevity — it signals the rep isn't starting over, just re-surfacing.

3. Time the bump 3–5 days after the unanswered email. Too soon (same day) looks desperate. Too late (two weeks) and the context has cooled enough that the prospect needs a new email, not a bump.

4. Don't use the same bump twice. One bump per thread. If the bump doesn't generate a reply, move to a full follow-up with a different angle or to the breakup email if the sequence is ending.

5. Test subject lines for the bump. 'Re: [original subject]' works well because it looks like a normal reply thread. Some reps change the subject to 'Quick question' for the bump step to refresh the open rate.

How Gangly generates bump messages

When a prospect has been active (opened email, visited a link) but hasn't replied, Gangly's Workflow Sequencer flags the account and suggests a bump step rather than the next standard sequence email. Outreach Writer generates the one-line bump — optionally with a fresh signal hook if Signal Detection has identified a new event at the account — and the rep approves with one click.

See how Outreach Writer works →

Frequently asked questions