I'm noticing a fair amount of spam getting through using letters in the
subject line that are outside the standard set of ASCII characters in an
effort to bypass spam filters. For example, instead of a capital "R",
there will be a letter that closely approximates a capital "R" but when
you look closely at it, you'll see the bottom of the rounded part of the
"R" never connects to the line running along the left side of the
letter.
I don't want to use a rule that is too-restrictive (like maybe banning
all non-standard ascii characters) but I also want to increase the
likelihood of email using these tactics getting flagged as spam.
I'm new to spamasssassin so I'm not sure if a rule like this already
exists or how I might go about finding this rule or what I should weight
it. I'm wondering if others on the list have rules to address this same
issue and can share their rule. Thanks.
subject line that are outside the standard set of ASCII characters in an
effort to bypass spam filters. For example, instead of a capital "R",
there will be a letter that closely approximates a capital "R" but when
you look closely at it, you'll see the bottom of the rounded part of the
"R" never connects to the line running along the left side of the
letter.
I don't want to use a rule that is too-restrictive (like maybe banning
all non-standard ascii characters) but I also want to increase the
likelihood of email using these tactics getting flagged as spam.
I'm new to spamasssassin so I'm not sure if a rule like this already
exists or how I might go about finding this rule or what I should weight
it. I'm wondering if others on the list have rules to address this same
issue and can share their rule. Thanks.