Be careful with that spam button: it probably won’t do what you want, but will instead make your spam filter worse.
Eventually a sufficiently capable filter will be likely to figure out that the thing these emails have in common is a poor text/plain part and adjust its weighting appropriately, but I’d expect it to take somewhere between “quite some time” and “a long time” to figure that out; in the mean time, it’ll mostly just serve to confuse the poor filter.
(How customised spam filters work, in a nutshell: take your various signals—e.g. has HTML, has remote images, has no text, is sent from a known-spammy IP address, mentions large sums of money—and figure out which factors occur more often in spam than ham, and increase the importance assigned to them; if the email reaches a chosen threshold, it’s showing sufficient characteristics of a spam message to be considered probably spam.)
SpamAssassin is probably the most widely-used spam filtering platform; I’m not certain that its standard rules are capable of deciding to filter on this sort of thing directly. I believe it has something around detecting overly short or non-representative text/plain parts, which is probably the primary signal this would coalesce around.
Eventually a sufficiently capable filter will be likely to figure out that the thing these emails have in common is a poor text/plain part and adjust its weighting appropriately, but I’d expect it to take somewhere between “quite some time” and “a long time” to figure that out; in the mean time, it’ll mostly just serve to confuse the poor filter.
(How customised spam filters work, in a nutshell: take your various signals—e.g. has HTML, has remote images, has no text, is sent from a known-spammy IP address, mentions large sums of money—and figure out which factors occur more often in spam than ham, and increase the importance assigned to them; if the email reaches a chosen threshold, it’s showing sufficient characteristics of a spam message to be considered probably spam.)
SpamAssassin is probably the most widely-used spam filtering platform; I’m not certain that its standard rules are capable of deciding to filter on this sort of thing directly. I believe it has something around detecting overly short or non-representative text/plain parts, which is probably the primary signal this would coalesce around.