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Old 10th September 2018
vanGrimoire's Avatar
vanGrimoire vanGrimoire is offline
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Posts: 42
Default Sendmail not parsing colons


I've tested sendmail from the commandline and found that I can send email if it does not contain a colon.
For example:
sendmail user@mailserver.com << EOF
Hello, this is a test email.
works, but this:

sendmail user@mailserver.com << EOF
Subject: Test email
This is a test email.subject: hello what!

sendmail: command failed: 550 5.7.1 Delivery not authorized, message refused: Message is not RFC 2822 compliant
does not.

Thanks in advance.
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Last edited by vanGrimoire; 11th September 2018 at 01:33 AM. Reason: title, more data
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Old 10th September 2018
jggimi's Avatar
jggimi jggimi is offline
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Join Date: May 2008
Location: USA
Posts: 6,631

I see one issue here in your test, and one in the sendmail(1) man page.

Here: your second Email is not RFC 2822 compliant. The colon is considered a header field delimiter (RFC 2822 section 2.2) and not part of the message body.

There: the man page says: "The sendmail enqueuer is not intended to be used directly to send mail, but rather via a frontend known as a mail user agent."
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rancid, sendmail, smtpd

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