>From documentation : postconf.5.html#resolve_dequoted_address
/resolve_dequoted_address (default: yes)
Resolve a recipient address safely instead of correctly, by looking
inside quotes.
By default, the Postfix address resolver does not quote the address
localpart as per RFC 822, so that additional @ or % or ! operators remain
visible. This behavior is safe but it is also technically incorrect.
If you specify "resolve_dequoted_address = no", then the Postfix
resolver will not know about additional @ etc. operators in the address
localpart. This opens opportunities for obscure mail relay attacks with
user@domain@domain addresses when Postfix provides backup MX service for
Sendmail systems.
/
Setting resolve_dequoted_address = no ==> us...@example.com@example.com
is rejected
Setting resolve_dequoted_address = yes ==> us...@example.com@example.com
is accepted
But as said in the doc seems to be a bad idea.
So what to do ?
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