Not only this (local) sender. Also other SMTP server which relay messages with same problem, or emails generated by application programs or network facilities which send simple alert emails not caring too much about CR LF.


Il 29/08/2022 14:56, Jeff Koch ha scritto:
Hi Tonino:

Does this mean that all of the emails this sender sends through her O365 server would be rejected ?

Jeff



On 8/29/2022 6:55 AM, Tonix wrote:

More exactly those messages will be rejected by remote O365 receiver servers whose admins will have enabled the SMTPSEND.BareLinefeedsAreIllegal flag.

Tonino

Il 28/08/2022 22:20, Jeff Koch ha scritto:
Thanks Tonix - so the result is that messages from email clients (like Outlook) that add multiple bare line feeds in their messages and use O365 will now get rejected by the qmail toaster.  How nice of Microsoft.

Jeff

On 8/28/2022 2:27 PM, to...@interazioni.it wrote:
This document explains the problem:
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

I will omit my thought on remote admins.
A very simple rule in communication is: be strict when sending, be tolerant when receiving.

Regards,
Tonino


Il 28 agosto 2022 19:24:13 CEST, Jeff Koch <jeffk...@intersessions.com> ha scritto:
>Further information:
>
>The sender also got the following message from his exchange mailserver when trying to send to our mailserver:
>
>Your message contains invalid characters (bare line feed characters) which the email servers at ......com don't support
>
>Jeff
>
>
>On 8/28/2022 12:45 PM, Jeff Koch wrote:
>>
>> Never heard of this before but an email sender to our mailserver got the following error message:
>>
>> 550 5.6.11 SMTPSEND.BareLinefeedsAreIllegal; message contains bare linefeeds, which cannot be sent via DATA and receiving system does not support BDAT
>>
>> Does anyone know whether the qmail toaster supports the SMTP protocol BDAT command ?
>>
>> Thanks,
>>
>> Jeff



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