Resending Emails: HELO/EHLO not yet given

[TC Dan]

Hi!

I'm having a couple of failed emails here (for reasons unrelated to this issue) and would like to resend them.
New mails are processed fine.

When I try to resend the failed ones (via /app/email_logs/email_logs.php) I get an error message saying "SMTP server error: HELO/EHLO not yet given", however.

Any hints on how to proceed?

 

[TC Dan]

Here's the SMTP related settings and the output for trying to send a test mail from email_logs.php (which also fails).

It seems like a TLS/STARTTLS issue, but I am not able to resolve it.

Why doesn't it occur when sending new emails?

 

[TC Dan]

To anyone having similar trouble in the future:

Turns out smtp-hostname needs to be set to 127.0.0.1.
New mails don't seem to require this for some reason, old mails do.