Email sending not functional: 'Expected response code "250" but got code "501"'

[Aterfax]

Current Behavior

Sending email / a test email fails with the following error message:

Whoops!

An error occurred while attempting to test mail settings: Expected response code "250" but got code "501", with message "501 HELO requires domain/address - see RFC-2821 4.1.1.1".

This is despite setting the SERVER_NAME env var as per #3110

This was also not fixed by forcing the docker container's hostname to a hostname with --hostname myhost.domain.com or fudging with #3216 adding the line as per.

Image: ccarney16/pterodactyl-panel:latest

Expected Behavior

Test email / normal emails should send correctly.

Steps to Reproduce

Use the Docker version of pteropanel (ccarney16/pterodactyl-panel:latest) and attempt to send an email via an account on a Poste2 email server.

Panel Version

v1.11.3

Wings Version

v1.11.4

Games and/or Eggs Affected

N/A

Docker Image

N/A

Error Logs

I found nothing relevant in the logs with debug on or off unfortunately.

Is there an existing issue for this?

• I have searched the existing issues before opening this issue.
• I have provided all relevant details, including the specific game and Docker images I am using if this issue is related to running a server.
• I have checked in the Discord server and believe this is a bug with the software, and not a configuration issue with my specific system.

[Boy132]

The env variable is now called MAIL_EHLO_DOMAIN afaik.

Side note: ccarney16/pterodactyl-panel:latest is a third party image and not the official one.

[Aterfax]

Yep, setting MAIL_EHLO_DOMAIN resolved this. Might be worth the documentation having a panel page that includes the current .env.example / all env vars as I suspect I was looking at older copies locally / at the online docs and drawing a blank.

[Boy132]

Might be worth the documentation having a panel page that includes the current .env.example / all env vars

FYI: pterodactyl/documentation#471 (& pterodactyl/documentation#492)