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A comment on The Correct Way to Validate Email Addresses. Parent comment

Re:The Correct Way to Validate Email Addresses by ceejayoz on Wednesday September 07, 2016 @10:13PM (#12449727)
A lot of spammers will rip out the + tagging on a Gmail account. Probably works better if you have a domain in front of it via Google Apps.
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Re:The Correct Way to Validate Email Addresses by blechschmidt on Wednesday September 07, 2016 @10:34PM (#12449828)
I do not use Gmail but a self-hosted Postfix instance. I have configured an alias for tagged use only and configured Postfix to reject all emails to this alias without a tag. This means that currently any tag will be delivered but luckily, I am not receiving any spam to this address at all.

Originally, I wanted to create a Postfix filter based on an HMAC together with a browser extension which would simply let me generate new valid email addresses in the form of prefix.HMAC(secret, prefix)@example.com but I have never implemented it.

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