On Mon, Apr 01, 2024 at 04:09:34PM -0400, David Mehler via Postfix-users wrote:

> In my master.cf I do have smtpd_tls_wrappermode but it's in the commented
> out service for port 465, I'm using submission.
> 
> I've checked with postconf and smtpd_tls_wrappermode is set to no.

Of course, but Thunderbird might be attempting wrapper-mode (implicit
TLS), which could then be logged as a pipelining violation.

> Is there any additional information I can provide?
> 
> Please keep the suggestions coming.

The full unedited log entry has already been requested.  For meaningful
help, post the log entry.

-- 
    Viktor.
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