error 5.3.3 Unrecognized command

I had to downgrade to 1.8.9 plugin version to get past this error.
From what I’m seeing, the plugin is forcing STARTTLS when trying to send an email and our email server doesn’t support that so all emails were failing.
I checked the postman database record in wp_options and it is set to none so there is some type of code level error that is enforcing this and not adhering to user settings. I also noticed when I change the user settings for auth to none it doesn’t save that either as the gui continues to reflect starttls (even though the database reflects none as originally mentioned).

@strikingwebsolutions

Do you use port 587 and not TLS??

What are your SMTP provider settings?

It’s a local exchange server that is on the same internal network – we use 587 and no, we do not use TLS. If your software is requiring TLS on 587 that’s not in line with the behavior of the former application and is a terrible change on your part.

I know, I was stupid to think that there is a standart and thought it will be nice to auto select port by auth.

Please give a few minutes to release a new version.

I think you are correct in that “traditionally” 587 utilization was associated with TLS / Authentication; however, numerous ISPs block 25 and therefore, as a result, really have pushed the industry norm from 25 to 587 (with or without TLS).

New version released, check it and update.

Thank you very much with the update the conflict is corrected.

I can also confirm from my side that the latest version is working for us.

Thanks!