[Users] [Bug 4138] New: Base64 subject gives bad spam rating

noreply at thewildbeast.co.uk noreply at thewildbeast.co.uk
Fri Dec 21 12:14:22 CET 2018


            Bug ID: 4138
           Summary: Base64 subject gives bad spam rating
    Classification: Unclassified
           Product: Claws Mail
           Version: other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: Other
          Assignee: users at lists.claws-mail.org
          Reporter: hanno at hboeck.de

I have a special character in my surname (Böck), so it gets encoded in the
"From" line.

Claws mail uses an utf8/base64 encoding, thus it becomes =?UTF-8?B?QsO2Y2s=?=.

Base64 encoded mail headers are often used for obfuscation by spammers, and
spamassassin has a filter rule (FROM_EXCESS_BASE64) which can give - depending
on the configuration - up to 1 point in spam rating.

I'd rather like to avoid that, but I think right now claws has no way to
configure the header encoding. (As a workaround I can however set an already
encoded name in the account config.)

Would it be possible to change claws to use quoted printable encoding instead
of base64?

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