Mautic email deliverability: replace SMTP with the Symfony Mailer DSN transport
Mautic is a marketing-automation platform, so email is the product, not a side effect. A contact form on a CMS sends a handful of messages a day; a Mautic campaign to a real segment can fan out to thousands in one send. That makes Mautic's mail transport the single highest-leverage setting in the whole install — and most Mautic docs still point you at generic SMTP. Mautic 5 doesn't need SMTP for…
Mautic, a marketing automation platform, heavily relies on email for its functionality. Most guides still recommend using generic SMTP, but Mautic 5 has moved from SwiftMailer to Symfony Mailer. This change allows for a more efficient and informative email delivery system. By replacing SMTP with the Symfony Mailer DSN transport and integrating MailKite, Mautic users can now receive detailed error messages instead of generic SMTP codes.
To implement this, install the MailKite Symfony Mailer package, set the DSN using an API key, and clear the Mautic cache. The DSN should point to the MailKite API, which will then provide clear explanations for any delivery errors. While this method improves error transparency, it does not alter the campaign send process, as that is managed by Mautic's own batch layer.
If Composer access is unavailable, the SMTP path remains functional but lacks the detailed error information.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written; read the original for the full account.
