How an exit condition works
An exit condition is a rule the platform checks while somebody is inside a sequence. If the rule becomes true, that person leaves and receives none of the remaining messages. Most tools check it before each step, and some check continuously while a contact is waiting.
The common rules are simple. Leave the cart sequence on placing an order. Leave the lead nurture sequence on booking a call. Leave any marketing sequence on unsubscribing, which the platform enforces regardless. Leave one sequence when a more specific one takes over, so a customer is not being handled by two flows at once.
Whatever the rule tests has to be something the platform can actually see. An exit set on an order event only fires if orders reach the email platform; an exit set on a tag only fires if something applies that tag. The rule is only as reliable as the data behind it.
Why exit conditions matter
They stop the sequence contradicting reality, which is the single most damaging thing an automated email can do. A customer who has paid and then receives another reminder about the basket they left, or a discount code the day after buying at full price, learns that the business is not paying attention. That impression is hard to undo and it costs more than the message was ever going to earn.
There is a technical benefit too. Emails that are obviously irrelevant collect complaints and unsubscribes, and both feed the reputation signals that decide whether your ordinary campaigns reach the inbox. A well-set exit condition protects deliverability for everything else you send.
Where exit conditions go wrong
The worst case is not setting one at all, and it is more common than it should be — the sequence works in testing, because the tester never buys, and the fault only appears once real customers do.
Close behind is an exit that checks the wrong thing. A rule watching for an online order will not notice a customer who rang up and paid over the phone, or who agreed the sale on WhatsApp and paid on delivery. In Nepal a large share of orders complete exactly that way, so a shop that only records web checkouts will keep chasing people who have already paid. The fix is to make the offline order visible to the platform, not to loosen the rule.
How to get it right
Write the exit before you write the messages. Ask what has to become true for this sequence to have finished its work, and set that as the rule; the emails are easier to write once the endpoint is clear.
Then make sure every route to that outcome reaches the platform. If sales are closed by phone or over WhatsApp, somebody or something has to record it against the contact, whether that is a CRM sync or a staff member applying a tag. Finally, test it the only way that proves anything: enter the sequence with your own address, complete the action the exit is watching for, and confirm the rest of the messages never arrive.