My cyrus-imapd-2.3.16-6.el6_2.5.x86_64 uses <cyrus@FQDN>.
I'd like to use the original envelope sender even if it doesn't play with SPF.
The MTA won't let you set envelope-sender because it's a security hole, so even though cyrus is saying "pretend that this email is from xxx@xxxxxxxxxxxxxx" the MTA sets it as cyrus@FQDN instead.
If you're using exim, add cyrus to your trusted_users line. That worked for me.
If you're not, you need to find the equivalent option in your MTA.
Geoff
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