Hey folks,
I have a puzzle that has me scratching my head. A few minutes ago I
tried to send a mail message with a PDF attachment ... and my mail
server rejected it.
Feb 11 14:05:03 minbar postfix/submission/smtpd[31748]: connect from
babylon5.caerllewys.net[10.24.32.10]
Feb 11 14:05:03 minbar postfix/submission/smtpd[31748]: Anonymous TLS
connection established from babylon5.caerllewys.net[10.24.32.10]:
TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange
X25519 server-signature ECDSA (prime256v1) server-digest SHA256
Feb 11 14:05:03 minbar postfix/submission/smtpd[31748]: NOQUEUE: permit:
RCPT from babylon5.caerllewys.net[10.24.32.10]: action=permit_mynetworks
for Client host=babylon5.caerllewys.net[10.24.32.10] ;
from=<[email protected]> to=<[email protected]>
proto=ESMTP helo=<[10.24.32.10]>
Feb 11 14:05:03 minbar postfix/submission/smtpd[31748]: 6BFB540B488B3:
client=babylon5.caerllewys.net[10.24.32.10]
Feb 11 14:05:03 minbar postfix/submission/smtpd[31748]: 6BFB540B488B3:
permit: RCPT from babylon5.caerllewys.net[10.24.32.10]:
action=permit_mynetworks for Client
host=babylon5.caerllewys.net[10.24.32.10] ; from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<[10.24.32.10]>
Feb 11 14:05:03 minbar postfix/submission/smtpd[31748]: 6BFB540B488B3:
permit: DATA from babylon5.caerllewys.net[10.24.32.10]: action=permit
for Data command=DATA ; from=<[email protected]> proto=ESMTP
helo=<[10.24.32.10]>
Feb 11 14:05:03 minbar postfix/cleanup[31750]: 6BFB540B488B3:
message-id=<[email protected]>
Feb 11 14:05:03 minbar postfix/cleanup[31750]: 6BFB540B488B3: reject:
header Content-Type: application/pdf; name="Amazon.com - Order?
113-0152552-4403477.pdf" from babylon5.caerllewys.net[10.24.32.10];
from=<[email protected]> to=<[email protected]> proto=ESMTP
helo=<[10.24.32.10]>: 5.7.1 message content rejected
Feb 11 14:05:03 minbar postfix/submission/smtpd[31748]: disconnect from
babylon5.caerllewys.net[10.24.32.10] ehlo=2 starttls=1 mail=1 rcpt=2
data=0/1 commands=6/7
Here's why I'm scratching my head over this:
*I don't filter PDF attachments.* There is no file ANYWHERE in my
configuration that even *contains* the case-insensitive character
sequence 'pdf' or any regexp that could match it. I have header_checks
= pcre:/etc/postfix/smtp_header_checks.pcre, but that file checks only
the following headers:
if /^X-Spam-Score:/
if /^To:/
if /^From:/
if /^Reply-To:/
if /^Return-path:/
if /^Subject:/
if /^X-Mailer:/
if /^User agent:/
if /^X-PHP-Originating-Script:/
if /^Authentication-Results:/
if /^Organisation:/
if /^Cc:/
I have mime_header_checks = pcre:/etc/postfix/mime_header_checks, but
that file contains only the following:
/name=[^>]*\.(bat|com|exe|dll|vbs|xls|zip)/ REJECT
I've successfully sent and received PDF attachments before. In fact, I
just did another test, sending a *different* PDF file between two local
accounts at different domains, and it worked perfectly with no complaint.
So why on EARTH is my mailserver rejecting *THIS* PDF attachment based
upon its Content-Type?
--
Phil Stracchino
Fenian House Publishing
[email protected]
[email protected]
Landline: +1.603.293.8485
Mobile: +1.603.998.6958
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