Fix “invalid email format” before a Klaviyo import

Klaviyo can skip email entries that are not in a valid format. A few invisible characters or malformed rows can turn a seemingly normal export into a failed or partial import.

Common causes

Typical causes include leading or trailing spaces, line breaks inside cells, missing @ symbols, malformed domains and shifted columns caused by broken CSV quoting.

What ReadyRows changes automatically

ReadyRows trims surrounding whitespace, removes embedded line breaks safely, normalizes email casing and flags addresses that still fail structural checks.

What it does not guess

An invalid address is not rewritten into a different address. If the local part or domain is genuinely missing, the row is moved to the rejected export so you can review it.

Official reference

Klaviyo describes invalid email formatting and line-break problems in its invalid format troubleshooting guide.

ReadyRows is an independent tool and is not affiliated with Klaviyo. Product rules can change; for account-specific decisions, confirm the latest guidance in Klaviyo's Help Center.