Hello !
When an Mail is forwarded to an SMTP Address the SMTP Header field “MAIL FROM:” ist left blank.
As a result some Mailserver with SPF activated do not accept the mail or more worse will delete the mail immediately as they cannot verify the Senders Address.
I could verify this on Releases 6.5.2, 7.0.2 and 8.5 ( all Linux)
Has anybody some Information concerning this strange beaviour ?
Thanks in advance.