Migrate / Klaviyo to Mailjet

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Migrate from Klaviyo to Mailjet

Pick a Klaviyo list and a Mailjet list. OpenContact reads the contacts from Klaviyo, keeps a copy, and writes them to Mailjet. No export file, no upload.

What gets copied

• Subscribed contacts are copied into the Mailjet list.
• Unsubscribed, bounced, complained or suppressed contacts are not added to the list. They stay excluded.
• Custom fields: Klaviyo profile details and properties become Mailjet contact properties. Fields that already exist are reused, matched by name, and values are converted to the field type.
• Saved segments are not copied. Rebuild them in Mailjet from the tags or fields they use.

Check first, then move

1. Connect Klaviyo (Private API key) and Mailjet (API key + secret).
2. Choose the source list and the destination list.
3. Check what will happen. The preview copies nothing. It shows the source count, how many of the first 100 contacts would be copied, excluded or skipped, which custom fields will be created, and how tags arrive.
4. Confirm that your Mailjet plan can take the contacts, then start. Follow fetched, pushed and failed totals as it runs. Pause and resume at any time.

Good to know

Moving from Klaviyo

• Klaviyo properties have no fixed list, so the migration learns them from the first few hundred profiles in the list. A property that only appears on later profiles is not copied.
• Profiles that never subscribed but are not suppressed can still receive Klaviyo email, so they are copied.

Moving to Mailjet

• Unsubscribed, bounced and complained contacts are excluded from campaigns in Mailjet instead of added, so a later import cannot bring them back by mistake.
• Mailjet keeps one contact per person. Someone in several lists is one contact there, added to each list.

After the move

Sync rules keep Klaviyo and Mailjet consistent from now on, and suppression stays honored in both. See suppression sync.

Questions