I am getting a very similar error using Proton Mail as my SMTP provider and have managed to patch the container to make it work. Only a temp solution while the containers are up.
Error in logs:
{"level":"error","time":"2026-06-21T00:25:56.366Z","service":"@pkgs/email/src/SmtpEmailProvider","env":"production","error":{"type":"Error","message":"401D5C8A577F0000:error:0A00010B:SSL routines:tls_validate_record_header:wrong version number:../deps/openssl/openssl/ssl/record/methods/tlsany_meth.c:77:\n","stack":"Error: 401D5C8A577F0000:error:0A00010B:SSL routines:tls_validate_record_header:wrong version number:../deps/openssl/openssl/ssl/record/methods/tlsany_meth.c:77:\n","library":"SSL routines","reason":"wrong version number","code":"ESOCKET","command":"CONN"},"msg":"SMTP send failed"}
To get it working I have set the below:
.env
FLUXER_EMAIL_ENABLED=true
FLUXER_EMAIL_PROVIDER=smtp
FLUXER_EMAIL_FROM_EMAIL=support@example.com
FLUXER_EMAIL_FROM_NAME=Fluxer Support
FLUXER_EMAIL_SMTP_HOST=smtp.protonmail.ch
FLUXER_EMAIL_SMTP_PORT=587
FLUXER_EMAIL_SMTP_USERNAME=support@example.com
FLUXER_EMAIL_SMTP_PASSWORD=xxxxxxxxxxxxxxx
FLUXER_EMAIL_SMTP_SECURE=false
In the api container fluxer-api-1 I am getting issues against the SmtpEmailProvider.ts file. It seems like the boolean isn't working as expected.
usr/src/app/fluxer_api/node_modules/.pnpm/@pkgs+email@file+fluxer_api+pkgs+email/node_modules/@pkgs/email/src/SmtpEmailProvider.ts
In SmtpEmailProvider.ts secure: config.secure ?? true is not passing correctly for me.
I patched the api container to update it to secure: config.secure !== undefined ? config.secure === "true" : true" and restarted the api container. It is now working.
Replicate:
api container
# Patch
docker exec fluxer-api-1 sed -i 's/secure: config.secure ?? true/secure: config.secure !== undefined ? config.secure === "true" : true/g' /usr/src/app/fluxer_api/node_modules/.pnpm/@pkgs+email@file+fluxer_api+pkgs+email/node_modules/@pkgs/email/src/SmtpEmailProvider.ts
# Verify
docker exec fluxer-api-1 grep "secure:" /usr/src/app/fluxer_api/node_modules/.pnpm/@pkgs+email@file+fluxer_api+pkgs+email/node_modules/@pkgs/email/src/SmtpEmailProvider.ts
# Restart just the API
docker compose restart api
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Comment by @Gaarindor
fluxer-api-1I am getting issues against theSmtpEmailProvider.tsfile. It seems like the boolean isn't working as expected.usr/src/app/fluxer_api/node_modules/.pnpm/@pkgs+email@file+fluxer_api+pkgs+email/node_modules/@pkgs/email/src/SmtpEmailProvider.tsIn SmtpEmailProvider.tssecure: config.secure ?? trueis not passing correctly for me. I patched the api container to update it tosecure: config.secure !== undefined ? config.secure === "true" : true"and restarted the api container. It is now working. Replicate: api container