TLS error from 'alt4.gmail-smtp-in.l.google.com': STARTTLS not advertised by host

[mast3rp1ece]

I've installed Stalwart alongside with Coolify, using this guide: https://aldertvaandering.com/blog/setting-up-stalwart-on-coolify, but with new image, getting 10/10 on mail-tester.com, all services show me, that i have ssl certificates, but can't send mail to gmail, getting this: (TLS error from 'alt4.gmail-smtp-in.l.google.com': STARTTLS not advertised by host.) But can sent it to some other mail(not gmail, outlook, yahoo).

Or maybe someone know better way, to install Stalwart alongside with Coolify?

This is logs, i'm getting - https://gist.github.com/mast3rp1ece/d27565e497cd6b664646fd85588730cd

[mast3rp1ece]

✅ Solved for me.
Set it to disabled in Stalwart UI — that fixed the error.
Settings > SMTP > Outbound > TLS: STARTTLS → disabled.

But now I'm using the Docker image from this guide:
coollabsio/coolify#4118 (comment)