On 09/03/2024 12:21, Lena--- via mailop wrote:
You will still run into a fair number of systems that still see % as
an attempt to do source routing and reject the message.

Including default Exim config:

https://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_default_configuration_file.html

deny    domains       = !+local_domains
         local_parts   = ^[./|] : ^.*[@%!] : ^.*/\\.\\./
         message       = Restricted characters in address



Exim, like Postfix, Courier and others calls it "percent hack".


Best
Ale
--





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