Mautic 5 users can swap SMTP for Symfony Mailer DSN to improve email deliverability

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Mautic 5, the open-source marketing automation platform, has moved from SwiftMailer to Symfony Mailer, enabling users to configure email delivery via a DSN string instead of traditional SMTP. MailKite, an email delivery service, offers a first-party Symfony Mailer transport that provides clearer error messages compared to generic SMTP responses. Users can install the transport via Composer, set an API key in the MAILER_DSN environment variable, and clear Mautic's cache to activate the new configuration. For managed Mautic hosts without Composer access, a standard SMTP fallback using MailKite credentials on port 587 with TLS is also supported. Successful delivery requires that all campaign sender addresses belong to domains with SPF and DKIM records properly configured.

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