Supports for BDAT extension?

[ivano-mvmnet]

hi, in the last period I have had several messages discarded because the version of qmail i run do not support messages with bare line feeds, and I wanted to understand if this version of qmail already had a patch about it[1] or was included in the roadmap.
I report a piece of an article from the microsoft site[2] believing that it is relevant to my problem:

Microsoft 365 and Office 365 used to remove bare line feeds from messages to enable delivery to older email servers that didn't support SMTP Chunking and the BDAT command. In an effort to better support security standards (for example, DomainKeys Identified Mail or DKIM), Office 365 no longer removes bare line feeds from messages.

[2] https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-6-11-in-exchange-online
[1] BDAT / CHUNCKING https://www.rfc-editor.org/rfc/rfc3030#ref-ESMTP

[schmonz]

Were the discarded messages trying to be sent from your qmail system to other mail hosts, or from other mail hosts to yours? How did you narrow down the problem to line feeds?

According to its manual page, qmail-smtpd(8)

returns a temporary error and drops the connection on bare LFs; see http://pobox.com/~djb/docs/smtplf.html.

If this is your problem, the usual workaround is fixcrio, with some caveats.

(If your problem is with injecting messages into your own qmail system, Life with qmail clarifies that situation.)

At a glance, I’m not sure how BDAT relates here. We have no specific plans for BDAT as yet.

[ivano-mvmnet]

I have some problem to receive from other mail hosts to mine. The error that appears lately is a generic 451 with the URL address you wrote in your answer. I should check if and how fixcrio implemented but this problem has been noticed in the last few months since I thought it was related to the microsoft document linked above.
Anyway thanks for the support I will go into the documentation more.