Re:Firefox Monitor
by megous on Wednesday June 05, 2019 @05:26PM
(#20109351)
It's not.
[ Parent
| on HN ]
See the sibling comment: https://news.ycombinator.com/item?id=20109564
RFCs don't define any meaning to '+' as described in this thread, except that local part of the address should be interpreted locally (usually by MDA), and preserved unmodified during message transfer.
There's no + aliasing in the specs. There's no interpretation defined for local part of email address.