I’m trying to enable auto-tagging of emails by SMTP username using the MP_TAGS_USERNAME option, but it doesn’t seem to be working.

Setup details:

• Mailpit Docker image: axllent/mailpit:latest
• Mailpit version: v1.28.2
• Environment variables:

MP_TAGS_USERNAME: true
MP_SMTP_AUTH_ACCEPT_ANY: true
MP_SMTP_AUTH_ALLOW_INSECURE: true
MP_DATABASE: /data/mailpit.db
TZ: Europe/Madrid
MP_UI_AUTH: xxx:xxx

Expected behavior:

Emails should be automatically tagged with the SMTP username when authentication is used.

Actual behavior:

No username-based tags are added to the emails.

Question:

Is auto-tagging by username supposed to work when using MP_SMTP_AUTH_ACCEPT_ANY?
If not, is this a limitation or a bug?
Is there any additional configuration required for MP_TAGS_USERNAME to work in this scenario?