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by sethammons 508 days ago
Not a gmail invention perhaps, but also not per RFC. That some use it to mean something special is not in the RFC. Actually, a significant number of SMTP servers don't even implement the required parts of the related RFCs, let alone fancy things like plus handling.
2 comments
em-bee 507 days ago
it is not in the SMTP RFC because it is a purely local matter that does not affect email routing.

there are a number of servers that support it. wikipedia lists some if them:

https://en.wikipedia.org/wiki/Email_address#Sub-addressing

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Sami_Lehtinen 503 days ago
Agreed, most of email servers and services are broken per RFC. I've blogged about this over and over again.
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