Stuart Gathman
67 lines
2.4 KiB
Plaintext
67 lines
2.4 KiB
Plaintext
Subject: Critical mail server configuration error
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This is an automatically generated Delivery Status Notification.
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THIS IS A WARNING MESSAGE ONLY.
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YOU DO *NOT* NEED TO RESEND YOUR MESSAGE.
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Delivery to the following recipients has been delayed.
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%(rcpt)s
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Subject: %(subject)s
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Someone at IP address %(connectip)s sent an email claiming
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to be from %(sender)s.
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If that wasn't you, then your domain, %(sender_domain)s,
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was forged - i.e. used without your knowlege or authorization by
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someone attempting to steal your mail identity. This is a very
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serious problem, and you need to provide authentication for your
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SMTP (email) servers to prevent criminals from forging your
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domain. The simplest step is usually to publish an SPF record
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with your Sender Policy.
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For more information, see: http://spf.pobox.com
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I hate to annoy you with a DSN (Delivery Status
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Notification) from a possibly forged email, but since you
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have not published a sender policy, there is no other way
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of bringing this to your attention.
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If it *was* you that sent the email, then your email domain
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or configuration is in error. If you don't know anything
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about mail servers, then pass this on to your SMTP (mail)
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server administrator. We have accepted the email anyway, in
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case it is important, but we couldn't find anything about
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the mail submitter at %(connectip)s to distinguish it from a
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zombie (compromised/infected computer - usually a Windows
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PC). There was no PTR record for its IP address (PTR names
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that contain the IP address don't count). RFC2821 requires
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that your hello name be a FQN (Fully Qualified domain Name,
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i.e. at least one dot) that resolves to the IP address of
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the mail sender. In addition, just like for PTR, we don't
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accept a helo name that contains the IP, since this doesn't
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help to identify you. The hello name you used,
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%(heloname)s, was invalid.
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Furthermore, there was no SPF record for the sending domain
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%(sender_domain)s. We even tried to find its IP in any A or
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MX records for your domain, but that failed also. We really
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should reject mail from anonymous mail clients, but in case
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it is important, we are accepting it anyway.
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We are sending you this message to alert you to the fact that
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Either - Someone is forging your domain.
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Or - You have problems with your email configuration.
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Or - Possibly both.
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If you need further assistance, please do not hesitate to
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contact me again.
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Kind regards,
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postmaster@%(receiver)s
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