Added ActiveCampaign Postmark plugin

Property	Value
description	Installed the official Postmark integration for transactional email delivery.

• Installed ActiveCampaign Postmark (Official) 1.19.1.
• Used Postmark as the shipped transactional email transport.
• Set the sender address to noreply@circea.co.
• Set the message stream to outbound.
• Left force_from disabled.
• Left force_html disabled.
• Left open tracking disabled.
• Left link tracking disabled.
• Left Postmark logging enabled.
• Completed the server-token setup with the secret kept redacted.
• Left the starter ready to send auth and form emails through Postmark-backed delivery instead of default PHP mail.