How do I select a specific Mailgun list to verify?

Mailgun is primarily a transactional email service, but it does support Mailing Lists — grouped recipients you can send broadcasts to. Valid Email Checker reads your Mailgun Mailing Lists and surfaces them in the standard list picker. Transactional sending logs are out of scope here. Credential setup is in the Mailgun integration guide.

Opening the picker

1. Open Integrations in the VEC sidebar.
2. Find the Mailgun row in Connected Integrations.
3. Click the three-dot menu and pick Sync Now.
4. A modal opens with the Mailgun logo and the list picker.
5. Pick exactly one Mailing List using the radio button.

What appears in the picker

• Mailing Lists — every Mailgun Mailing List visible to your API key.
• Member counts — pulled live from Mailgun for each list.
• Search field — filters by list name in real time.

Transactional-only recipients (addresses you have sent transactional emails to but who do not belong to any Mailing List) are not selectable. If you want to verify those, export them from your Mailgun logs and use the bulk upload path instead.

EU vs. US regions

Mailgun runs separate infrastructure in the EU and US. VEC respects the region setting you supplied at connect time. If you have lists in both regions, connect separately for each — one connection per region. The connection name should make the region obvious for your future self ("Mailgun EU - acme.com", "Mailgun US - acme.com").

Sizing the cost

The credits-needed line at the bottom of the modal uses the Mailgun member count for the selected list. Duplicate removal (on by default) lowers the actual spend. Unknown-status results refund automatically after verification.

Refreshing list data

Click the refresh icon at the top of the modal. VEC re-queries Mailgun and updates member counts in place. Use after adding members to a Mailing List or creating new lists.

After picking the list

Choose Verify Only (default — Mailgun untouched) or Clean List Automatically. Hit Import List, and you are redirected to Uploads & Results to watch progress.

Troubleshooting

• Mailing List missing — make sure your API key has access to the right region and that the Mailing List actually exists in Mailgun.
• Empty picker — the Mailgun account has no Mailing Lists yet. Mailgun-only-transactional accounts often start out this way.
• Member count zero — the Mailing List has no members. VEC blocks Import on zero-count lists.