When using SMTP Authentication with exim and the default configuration you will find that exim rewrites the sender address to "email@address"@smtp_server_hostname
Return-Path: <"email@example.com"@xxxx.xxxx.co.za> ... Sender: "firstname.lastname@example.org"@xxxx.xxxx.co.za ...
To fix this you need to modify your acl_check_rcp acl and add sender_retain to control.
accept authenticated = * control = submission/sender_retain
Restart exim and you are good to go.
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