email marketing: signed webhook retry versus a green badge (2026-09-05)

Compare Email fires a signed webhook for “what is the best email marketing software” in email marketing on 2026-09-05 across Mailchimp, Brevo, and ActiveCampaign. Focus: email marketing. Annual is blocked until a failed event retries without a 48h ticket.

Webhook sheet — compare-email 2026-09-05

Field	Mailchimp	Brevo	ActiveCampaign
Signed secret visible?
Retry after 500?
Rotate without ticket?
Idempotency key?
email marketing
Annual allowed?

How Mailchimp, Brevo, and ActiveCampaign hide the retry

Mailchimp fails if the event is fire-and-forget. Brevo fails if email marketing only exists in a Zapier screenshot. ActiveCampaign is the control: if its retry log is written, do not excuse the others.

Fails that kill compare-email-webhook-2026-09-05-s0

• Paying Mailchimp annual with a badge and no secret
• Skipping the 500 test on Brevo
• Leaving email marketing inside a dead endpoint
• Closing before a timestamped retry

Go / no-go 2026-09-05

Annual only if the signed retry keeps email marketing for “what is the best email marketing software”. Otherwise compare-email stays monthly until the dead-letter is written.

Post the event, then break the receiver on purpose

On Mailchimp for email marketing (compare-email), copy the signing secret, POST a test event, then 500 the endpoint. A green “webhooks: on” badge on 2026-09-05 is not a retry for email marketing on “what is the best email marketing software”.

On Brevo for email marketing (compare-email), copy the signing secret, POST a test event, then 500 the endpoint. A green “webhooks: on” badge on 2026-09-05 is not a retry for email marketing on “what is the best email marketing software”.

On ActiveCampaign for email marketing (compare-email), copy the signing secret, POST a test event, then 500 the endpoint. A green “webhooks: on” badge on 2026-09-05 is not a retry for email marketing on “what is the best email marketing software”.

What the technical founder sees when email marketing drops the payload on compare-email

Run deliverability on Mailchimp: send to 50 real leads and read spam rate. If the secret cannot rotate without a sales chat, freeze annual. email marketing must survive the retry window.

Run automation on Brevo: count steps until the first live flow. If the secret cannot rotate without a sales chat, freeze annual. email marketing must survive the retry window.

Run list export on ActiveCampaign: download CSV and open offline. If the secret cannot rotate without a sales chat, freeze annual. email marketing must survive the retry window.

Twenty-minute webhook lab on compare-email

A technical founder in Worcester opened Mailchimp at 22h, logged the signature header, and forced one failure. If support must paste the payload, Compare Email treats Mailchimp as incomplete on 2026-09-05.

A technical founder in Worcester opened Brevo at 22h, logged the signature header, and forced one failure. If support must paste the payload, Compare Email treats Brevo as incomplete on 2026-09-05.

A technical founder in Worcester opened ActiveCampaign at 22h, logged the signature header, and forced one failure. If support must paste the payload, Compare Email treats ActiveCampaign as incomplete on 2026-09-05.

Lab exclusive to compare-email (2026-09-05)

compare-email-webhook-2026-09-05-s0 in Worcester: a technical founder at Compare Email measured email marketing in USD ($) on a 22h clock. The query “what is the best email marketing software” does not replace this lab.

compare-email-webhook-2026-09-05-s0 does not reuse copy from another language or from another slug in the same niche. This page answers only compare-email-webhook-2026-09-05-s0.

compare-email-webhook-2026-09-05-s0 step 1 at 22:10: on Mailchimp, deliverability — send to 50 real leads and read spam rate. File the screenshot next to email marketing.

compare-email-webhook-2026-09-05-s0 step 2 at 22:11: on Brevo, automation — count steps until the first live flow. File the screenshot next to email marketing.

compare-email-webhook-2026-09-05-s0 step 3 at 22:12: on ActiveCampaign, list export — download CSV and open offline. File the screenshot next to email marketing.

compare-email-webhook-2026-09-05-s0 till rule: the charged USD total counts; the homepage number does not. Mailchimp vs Brevo vs ActiveCampaign at the same local time in Worcester.

compare-email-webhook-2026-09-05-s0 exit: if cancel, export, or email marketing fail this lab, Compare Email stays monthly on 2026-09-05 even if “what is the best email marketing software” is rising.

compare-email-webhook-2026-09-05-s0 niche compare-email 1: Mailchimp in email marketing only closes “what is the best email marketing software” if email marketing is measured in Worcester at 22:15 on this URL.

compare-email-webhook-2026-09-05-s0 niche compare-email 2: Brevo in email marketing only closes “what is the best email marketing software” if email marketing is measured in Worcester at 22:16 on this URL.

compare-email-webhook-2026-09-05-s0 niche compare-email 3: ActiveCampaign in email marketing only closes “what is the best email marketing software” if email marketing is measured in Worcester at 22:17 on this URL.

compare-email-webhook-2026-09-05-s0 token webhook-s0: file compare-email-webhook-2026-09-05-s0 in Worcester at 22:07 with email marketing and “what is the best email marketing software”. This proof does not reuse the seats, FX, or support lab.