Common failures
Spraying a huge unfiltered list. It happens because volume feels like progress and a bigger list looks like more pipeline. It is the opposite: irrelevant sends drag your reply rate down towards the 1 to 3% floor, burn your domain reputation, and train buyers to ignore you. Avoid it by gating entry on a real trigger and fit, and accepting that fifty right accounts beat five thousand "maybe" ones.
Generic merge-field "personalisation". Teams reach for {{first_name}} and {{company}} and call it personalised, because real research does not scale. Buyers read merge fields as a tell. Avoid it by tiering: hand-write the top accounts, build natural-reading lines from real structured signals for the middle, and never pretend a token is attention.
Follow-ups that just repeat the ask. "Circling back" is the path of least resistance when you have nothing new to say. Each repeat erodes the relationship. Avoid it by writing every step around a genuinely different angle, value, or question that assumes the last one was read and ignored.
Ignoring deliverability until replies vanish. There is no alert when you start landing in spam, so teams keep optimising copy while the real problem is invisible filtering. Avoid it by setting up SPF, DKIM, DMARC, a separate domain, warming and list verification before you scale, and checking inbox placement first whenever replies drop without a content reason.
Letting automation keep firing after a reply. A misconfigured sequence sends the next scheduled email to someone who already engaged, the loudest possible "nobody is home" signal. Avoid it by wiring replies to pull the contact out automatically and route them to a person with full context.
Sequences that only ask for a meeting. Every step ends in a calendar link, so the only success state is a booked slot, and most buyers are not ready for that on contact one. Avoid it by lowering the bar to a question or a useful exchange that starts a conversation, then selling inside the conversation.