Best way to prevent failure-notice-emails?

Question

I am sure some (most?) of you know this:

1. Your users ask a question anonymously, and enter their notification email

2. The email was set wrong, so the email gets returned

3. your email folder gets a bunch of "failure notice" emails each day.

Of course, I could just set up an email filter client- or server-side, but maybe someone has a better idea to prevent the problem from the beginning?

 

Example Mail:

Hi. This is the qmail-send program at ***
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

email@me.com:
Sorry, I wasn't able to establish an SMTP connection. (#4.4.1)
I'm not going to try again; this message has been in the queue too long.

Comments

Why a filter (client side or server side ) is not ok ? Which alternative way were you thinking about ?

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This is up to creativity :) I don't know if you can somehow tell the mail server to communicate to q2a. Maybe some other idea could help.

Answer 1

I would try to use an email address validation service, via APIs.

Some of them should be free :

http://verify-email.org/using-api.html

If the API says KO ---> "error, please check the email address you've inserted".