[Evolution-users] Evolution 3.56.1 NDR: SMTPSEND.BareLinefeedsAreIllegal;

[Allen Hewes]

On Tue, 2025-04-29 at 07:34 +0200, Milan Crha via evolution-users
wrote:
> On Tue, 2025-04-29 at 03:07 +0200, Allen Hewes via evolution-users
> wrote:
> > mx1.motosnap.com gave this error:
> > SMTPSEND.BareLinefeedsAreIllegal; message contains bare linefeeds,
> > which cannot be sent via DATA and receiving system does not support
> > BDAT
>
>       Hi,
> that's the first time I see any such thing. Is it that you send the
> message through the Microsoft 365 account, not through an in-
> evolution
> configured SMTP server?

Hi Milan!

I am not using any sending/relaying SMTP server that I know of. I only
have my Microsoft 365 account configured. I am assuming, it's using
HTTPS to send? I don't see any preferences section for me to fiddle
with my outbound e-mail (or in-bound either for that matter). It's all
Milan's Microsoft 365 Magic... ;-)


>
> Microsoft has an article explaining the problem here:
> https://learn.microsoft.com/en-us/exchange/troubleshoot/antispam-and-protection/smtpsend-barelinefeedsareillegal-when-tracing-messages
>

Yep, came across that, but I thought it was for clients/end-users of
Microsoft Exchange Online/Office365/Microsoft365 when they didn't get
e-mail and performed a Exchange Online trace. So this would be for
clients delivering e-mail to Exchange Online/Office365/Microsoft365
mailboxes wouldn't it?

The NDR I got wasn't from Microsoft's servers, it was from (what I can
gather) the recipient's e-mail server. It looks like they are
outsourcing e-mail.



> I believe a change on the evolution-data-server or evolution-ews side
> is needed, depending how you send the message.
>
> > The message I got is an HTML message.
>
> Does it happen with other messages too? Did you simply Reply to that
> message and wrote your note somewhere at the top/middle/bottom of the
> message? I'd like to find a way to reproduce this.

This is the first time I have gotten a NDR like this w/Evolution, but I
have been changing Evolution versions (as you know) a lot lately.

It's only happened this one time, but I generally don't keep/retain the
"rich" formatting folks send me. I convert it to plain text then edit
the reply or forward.

This time, I opened an HTML e-mail. I had to download images because I
turn off automatic downloading of images in HTML e-mail. I then hit
Forward. I selected "My setting for Forwards is that they are added as
attachments to new blank messages. But the Subject line has something
like "Fwd: <original subject>".

In the empty message body (with an attachment at the bottom), I did add
a message to recipient.

I don't have the Forwards are in-lined option on, I am using Forwards
are attachments to new e-mails (while keeping the original message
window open). I think it's named "Forward style:" in the Composer
Preferences.

I was able to get my "Forward" to my recipient by doing "Reply to
Sender" and editing the To field (and choosing Don't loose formatting).

Best,

/allen