SMTP error: Must issue a STARTTLS command first

As I mentioned via PM, I can’t give access to the server due to security concerns. But thanks very much to @pfaffman for your help and for trying to solve this issue.

Let me add more context to this issue: a previous admin installed Discourse with the Mailgun SMTP service but it stopped to work and I don’t have access to that account.

As I said, I am trying to configure it now with Mailersend. I have read this topic [1] and others about STARTTLS here in the forum, but I am not sure about how to implement the changes needed.

I tried this setting below as well but the errror remains

DISCOURSE_SMTP_OPENSSL_VERIFY_MODE: none

If it is related to some recent update, maybe is it better to consider a downgrade then?

[1] Can't send email with certificate issue - #3 by supermathie

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