this post was submitted on 29 Nov 2025
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Joplin

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Hi,

I set up a Joplin Server on Docker om my Synology NAS. Unfortunately I can't sent any email

Here is the mailing part of my Docker Compose

Spoiler


MAILER_ENABLED: ssl MAILER_HOST: server.provider.net MAILER_PORT: 465 MAILER_SECURITY: true MAILER_AUTH_USER: xxx@example.com MAILER_AUTH_PASSWORD: totallysecure MAILER_NOREPLY_NAME: Joplin Server MAILER_NOREPLY_EMAIL: xxx@example.com

In the logs I can find this

Spoiler


[error] EmailService: Could not run maintenance: Error: Could not initialize transporter. Service will be disabled: Greeting never received

23:39:30 1|app | at SMTPConnection._formatError (/home/joplin/packages/server/node_modules/nodemailer/lib/smtp-connection/index.js:809:19)

23:39:30 1|app | at SMTPConnection._onError (/home/joplin/packages/server/node_modules/nodemailer/lib/smtp-connection/index.js:795:20)

23:39:30 1|app | at Timeout. (/home/joplin/packages/server/node_modules/nodemailer/lib/smtp-connection/index.js:729:22)

23:39:30 1|app | at listOnTimeout (node:internal/timers:569:17)

23:39:30 1|app | at processTimers (node:internal/timers:512:7) {

23:39:30 1|app | code: 'ETIMEDOUT',

23:39:30 1|app | command: 'CONN'

23:39:30 1|app | }

Any Ideas?

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[โ€“] kachelkaiser@feddit.org 1 points 2 weeks ago* (last edited 2 weeks ago)

Thank you.

I tried these things. I can get a shell using the command you gave me.

Bute the second test withj openssl does not work within the container shell because of the missing openssl command.

But it worked directly on the NAS. i got

220 mxe83f.netcup.net ESMTP Postfix (Debian/GNU) as response from the server