Red Hat Bugzilla – Bug 150088
Non printable characters cause fetchmail syntax errors
Last modified: 2007-11-30 17:07:06 EST
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Description of problem:
Some spam arrives at my mail server with unprintable characters in the "from" address. When fetchmail attempts to download it to my local machine using POP3,
it gives the error:
fetchmail: SMTP error: 501 5.1.7 Syntax error in mailbox address "t[???email@example.com" (non-printable character)
Later versions of fetchmail (e.g. fetchmail-6.2.5-2 as found in FC2) fix this
problem. However, the latest version available for RHEL3 is only 6.2.0-3. This
is causing my mailbox to fill up with large numebrs of errors from cron as
fetchmail complains about the malformed messages each time it's run.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Send a message with a non printable character in the from address to yourself
2. Attempt to download it using fetchmail
I'm sorry for the late response.
Fetchmail <=6.2.3 is keeping the messages in the source mailbox
if the bounce is sent to the postmaster; it is safer than deleting
the e-mail because the bounce doesn't contain the body of the
e-mail; if the e-mail were legitimate, it would be lost.
I think that changing this behavior within a RHEL series would be breaking
the stability promise of RHEL.
You can configure fetchmail to just delete e-mails when it recieves a 501
response from the SMTP server (>instead of keeping them in the mailbox and
sending a bounce) by adding 501 to the "antispam" variable in your