Select ESP (Email Service Provider) at Email Send Time in Mautic

Development
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What I’m Trying to Do

I would like to configure two different ESPs (Email Service Providers) in Mautic (e.g., Amazon SES and SendGrid), and when sending an email (manually or via campaign), I want Mautic to prompt me to select from which ESP the email should be sent.

Example Workflow

  1. I configure two ESPs in Mautic:
  • ESP A: Amazon SES (SMTP/API)
  • ESP B: SendGrid (SMTP/API)
  1. While creating or sending an email (either through campaigns or broadcast), Mautic should allow me to choose ESP A or ESP B.
  2. Based on the selected ESP, the correct mail transport is used during the sending process.

What I’ve Found So Far

  • Mautic only supports one global ESP configuration at a time under Settings > Configuration > Email Settings.
  • There is no native support to choose between multiple ESPs per email or campaign.
  • Some suggest using custom plugins or transport override logic with Symfony events (e.g., EmailSendEvent), but this requires custom development.
  • I’m aware it’s technically possible to switch ESPs dynamically by intercepting the email sending process via custom code.

What I’m Looking For

  • Is there any existing plugin or community solution that:
    • Allows selecting between multiple ESPs per email or campaign?
    • Provides a UI option in the email creation or campaign step to choose the ESP?
  • If no plugin exists, has anyone attempted this before? Any code snippets or guidance would be helpful.
  • If not available, I am considering building a plugin to:
  • Add a custom field (esp_choice) to the email or campaign.
  • Dynamically switch the mail transport at send time based on this field.