Root URL Settings, SSL, HELO hostname

[candideu]

Hello! I've deployed the app in Heroku and I'm filling out the Settings. I'm still pretty new to this.

Under the "General" tab, I'm not sure what to put for "Root URL - Public URL of the installation".

I have a domain name for my site already -- should I create a subdomain with my registrar? If so, are there any resources on doing so, and what I should be pointing things to?

Is the root URL the same thing that I would enter in the "HELO hostname" field of the "SMTP" tab in the settings?

Lastly, I have SSL set up through my registrar. If I set up this root URL to a subdomain, will it apply to Listmonk?

[knadh]

Under the "General" tab, I'm not sure what to put for "Root URL - Public URL of the installation".

It's the URL of your Heroku app, the default Heroku domain or whatever custom domain you may have assigned to it. So either your-site.herokuapp.com or yourcustomsite.com (or a subdomain if that's what you're assigning)

Is the root URL the same thing that I would enter in the "HELO hostname" field of the "SMTP" tab in the settings?

HELO is SMTP specific. If your SMTP server does not ask for it, it should be left blank.

Lastly, I have SSL set up through my registrar. If I set up this root URL to a subdomain, will it apply to Listmonk?

hm, I'm not sure what this means. You should refer to Heroku docs on SSL for custom domains.

[candideu]

Thanks for your help @knadh! Using the Heroku domain worked. 😄

For Heroku: since I'm on the free plan, the SSL only works if I use the Heroku-provided domain.

[MaximilianKohler]

HELO is SMTP specific. If your SMTP server does not ask for it, it should be left blank.

I was searching for "HELO hostname amazon ses", and Amazon seems to reference EHLO instead.

This says they're the same:

The EHLO procedure allows the client to identify itself to the SMTP server. The HELO procedure performs the equivalent functionality, but returns less information about the server.

I had mine on listmonk.mydomain.com, the same as the "root URL", but I guess I'll remove it.

EDIT:

I don't see much info on "LOGIN, PLAIN, CRAM", but these say CRAM is the most secure:

• https://mailtrap.io/blog/smtp-auth/
• https://www.ionos.com/digitalguide/e-mail/technical-matters/smtp-auth/

CRAM didn't work with SES though. 504 The requested authentication mechanism is not supported