Re: [PLUG] OpenSMTPD RFC 2822 Error

On Tue, Dec 5, 2023 at 11:26 AM George A. Theall via plug <plug@lists.phillylinux.org> wrote:

On Tue, Dec 05, 2023 at 11:08:04AM -0500, George A. Theall via plug wrote:
>On Tue, Dec 05, 2023 at 10:46:55AM -0500, N. Albert via plug wrote:
>>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.
>
>
>Another issue may be that the line starting "This is a test" is not
>separated from the headers above it by an empty line so it's regarded
>not as the message body but as a header line. And an invalid header
>since it doesn't contain a colon and header body.

Lastly, make sure the lines you are sending end with CR and LF, not CR by
itself; eg, see telnet's crlf toggle.

George
--
theall@tifaware.com
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