N. Albert via plug on 5 Dec 2023 07:47:10 -0800


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Re: [PLUG] OpenSMTPD RFC 2822 Error 

On 12/5/2023 10:17 AM, Casey Bralla via plug wrote:
I'm building an OpenSMTPD mailer server in a virtualbox test environment.  The test environment has a Bind9 DNS service running that recognizes XYZ.com as a valid domain.  The test OpenSMTPD mail server is listed in the DNS as the mail server for that domain.
I'm at the initial testing phase, but getting an RFC 2822 error.  As far as I can tell, my message is RFC 2822 compliant, but OpenSMTPD seems to disagree. 

Can anybody see what I'm doing wrong?  Here is my test sequence:

    telnet localhost 25
    Trying ::1...
    Connected to localhost.
    Escape character is '^]'.
    220 T-Mail ESMTP OpenSMTPD
    ehlo xyz.com
    250-T-Mail Hello xyz.com [::1], pleased to meet you
    250-8BITMIME
    250-ENHANCEDSTATUSCODES
    250-SIZE 36700160
    250-DSN
    250 HELP
    mail from: <casey@xyz.com>
    250 2.0.0 Ok
    rcpt to: <casey@xyz.com>
    250 2.1.5 Destination address valid: Recipient ok
    data
    354 Enter mail, end with "." on a line by itself
    date: Tue, 2023-12-05 10:13:00 AM
    from: <casey@xyz.com>
    subject: Test
    This is a test eMail.
    .
    550 5.7.1 Delivery not authorized, message refused: Message is not
    RFC 2822 compliant


The logs don't add any additional detail about the error.
As far as I can tell, RFC 2822 mandates a "date:" and "From: " field in the message data block.  I think I've got those present.  However, OpenSMTPD is notoriously persnickety about following the RFCs.
I don't think your "Date" header is compliant. In particular, you're missing the UTC offset at the end, which I believe is technically required for compliance, and your format in general is non-standard. RFC 2822 itself discusses this. Something more like this is what I would expect: 

Date: Tue, 5 Dec 2023 10:13:00 -0500
Also, per the SMTP RFC, there should not be a space between MAIL FROM and :, as well as RCPT TO and :. - it looks like your example contains spaces. OpenSMTPD appears to be tolerant of this, but other servers may not be. 
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