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Comments
Mention "Nigerian viagra from china" and you might involucrate some spam filters into action.
Use an email sending provider from https://www.spamhaus.org/statistics/networks/
Set dmarc record to quarantine and use mail server that not listed on spf records
Get a VPS from a provider that uses ColoCrossing. I guarantee all email you send from that server will end up in the spam folder.
Can't make a filter? This is how I set my automated warnings and notifications to go each to their box.
^This.
Instead of reinventing the wheel to complete this task, why not just use the tools available in (I assume) all desktop and web based email clients to create a filter.
Otherwise, my guess would be to use a free .tk domain name (are those still a thing?) and include, "Offer for you" in the subject line.
Maybe @Jar can give better advice since he deals with email as a business.
include GTUBE test string in your mail https://en.m.wikipedia.org/wiki/GTUBE
Pretty skeptical of it. User didn't say it should be read by a script or a process, and if they can't use a filter in the email client or on the server then they're hoping to send an email to someone who isn't planning ahead for receiving it, and ensure that a normal email client processes the email while the user doesn't see it. Sounds a lot like someone trying to exploit something to me.
Initially I was thinking the same but then I thought there is some app or plugin.
Man, I have seen some really weird applications of old protocols, such as FTP and even ICMP to deliver simple messages across the internet.
On second thought, though, such an app or plugin would have own filters pre-programmed, so you are probably right.
@jar @Mauonique
The mail had in mind was a sort of mail adderss control verification email that server sent a token and client reply to server after sign the token with its account key, so client side filter didn't work (as user can type any mail and mail will sent to verify that address), then I realize that I may not need to care about it because there are all the site have registration mail varification and no problem caused by it. but I still have worrysome about it as most of such mail have capture in it, while this is totally automated process, but sane rate limit will solve that.
Protocol I was looking at:
https://www.rfc-editor.org/rfc/rfc8823.html