Today in "Google broke email"
Dear Lazyweb, if I have to self-host IMAP for my non-nerd staff, how do I deal with filtering?
I am *begging* you to read the whole post before replying:
Currently, my staff emails arrive at their @dnalounge.com address and Postfix forwards to their Gmail addresses with all of the usual DMARC/DKIM/ARC/SPF flavoring. It mostly works. Mostly. If I am interpreting this page correctly, it says that starting in January, Gmail is going to ...
https://jwz.org/b/ylC1
@jwz
I think I run a setup close as what you want.
mail arrive at postfix MX
1- a rewrite rule in /etc/postfix/headers_check changes change the from header to :
"Sender description" "sender@externaldomain.com" <mailrelay@yourdomain.com>
then gets forwarded to some gmail outlook etc (in /etc/postfix/virtual)
Most of things happens with the email client,
from a mail client (claws-mail on desktop and k9-mail on android in my case), you can use the "send from" functionality.
1/n