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Someone is sending our public email address a lot of rude email. Basically, stuff filled with threats, expletives, insults and offensive jargon.

I know how to set up a filter in Gmail so that all message from a particular email address are auto-deleted. I'm wondering if there's a way for Gmail to send him back an NDR. "NDR" is basically the technical term for a bounce message.

Anyone ever seen anything like this? Any labs that do this?

Any third party services that do this on your behalf?

It would be a great little tool which I think a lot of people would use. Sort of a "you've been blocked!" auto-reply.

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migrated from superuser.com Aug 17 '11 at 18:04

This question came from our site for computer enthusiasts and power users.

Wouldn't you rather just silently drop their emails? Telling them they've been blocked will just confirm that you know they exist and that they're getting through to you, which may just lead to more crap from them. It might be better to just delete the messages, and move on. – nhinkle Aug 17 '11 at 18:04
Threats may be actionable. If he's threatening bodily harm, you should contact the police. If he's threatening business-type threats ("I'll sue!"; "I'll post nasty reviews everywhere!") you should contact a lawyer. – Al E. Aug 17 '11 at 19:53
up vote 14 down vote accepted

There is no way to send back an actual SMTP bounce message, but you can send back an automated response if you really want to. Go to your Gmail Labs Settings and turn on the "Canned Responses" lab. This lets you save snippets of text, which can then be inserted into emails automatically.

Create a new message, the way you normally would. Write the auto-response you want to send to your trouble-making email sender. Click on the "Canned responses" menu, and choose "Save as new canned response"

Now, go edit the filter for your hooligan. Under the filter actions page, check the box for "send canned response", and select the response you want to send. Voila! Now, any time you receive an email from them, your predefined message will automatically be dispatched to tell them what an evil emailer they are.

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Brilliant. Thanks! Didn't realize canned responses hooked into the filter area. – wahtimswa1970 Sep 17 '11 at 15:36
Some more syntax examples - lifehack.org/articles/technology/… – Ralph Willgoss Mar 11 '13 at 23:56

Use this Chrome plugin for Gmail.

It allows you to block a sender and send a "real" bounce message (meaning it will have the headers and response of a real bounce message, so it will look like the email was never received). A lot better than the canned response option.

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Don't use this method. A lot of spammers will use false reply addresses, and in some cases will use the address of an innocent party, in which case your 'bounce' is just amplifying the spam problem! – IanB Nov 25 '15 at 23:12

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