How to log the actual transport used with Symfony Mailer and Monolog? #61030

sdespont · 2025-07-03T13:24:47Z

sdespont
Jul 3, 2025

Hello,

I am using Symfony Mailer with two configured transports:

framework:
    mailer:
        transports:
            main: '%env(MAILER_DSN)%'
            tracking: '%env(MAILER_DSN_MONOLOG)%'

After reading the Symfony Mailer documentation, I could not find a way to log which transport was actually used for sending each email when using custom X-Transport header.

I have enabled a dedicated Monolog channel for mailer logs:

monolog:
    channels: ['mailer']

But this only logs basic email info, not the actual transport name or DSN that was used to send the message.

How can I reliably log the transport used for each email (including the transport alias or DSN) using Monolog or an event subscriber?

Thank you for your help!

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

Uh oh!

How to log the actual transport used with Symfony Mailer and Monolog? #61030

Uh oh!

{{title}}

Uh oh!

Replies: 0 comments

Select a reply

Uh oh!

Uh oh!

How to log the actual transport used with Symfony Mailer and Monolog? #61030

Uh oh!

sdespont Jul 3, 2025

Replies: 0 comments

sdespont
Jul 3, 2025