Basically ALL email servers work like that.. if a person 'forwards' an
email, there is no issue, the email client creates a new properly
formatted message, but if the system is configured to 'forward' all
mail, there is a problem.
In addition to Scott's eloquent way of phrasing this, remember if a
single spam slips through your filters, it now looks to Gmail as if your
server is leaking spam.
Every email client can check multiple mailboxes.. and easy to have two
webmail tabs open, one for Gmail, and one for your other
provider..Nowadays, most webmails even allow 'notifications'.
On 2025-08-14 11:00, Rob McEwen via mailop wrote:
------ Original Message ------
From "L. Mark Stone via mailop" <mailop@mailop.org
<mailto:mailop@mailop.org>>
FWIW, our company focuses on Zimbra software, and in the Zimbra web
client, when you select the "Forward" action, the Zimbra web client
actually crafts a brand new email message but tarts it all up to look
like a forward. Such emails then pass SPF no problem, since the
envelope sender's domain is the user doing the "forwarding".
Mark,
This is an excellent feature overall - I wish more systems had something
like this built-in - but as I'm sure you're aware - it can greatly
backfire if/when spam slips past the filter and gets forwarded - but
systems with better/superior filtering are going to have far FEWER
issues that those with poor or average spam filtering.... because it
sure seems like the recipient email hosts (especially the large
providers) - are going to assign MORE blame for THESE types of spams
that get forwarded in THIS way - than they would if it was a "regular"
forwarding. (I don't have a shred of evidence to back that up - but
that's a very very "educated guess")
This doesn't mean that such a feature is bad idea - but that does make
it all the more important that such a feature only get implemented
if/when email hosting system that is doing such forwarding - has very
accurate and high-quality spam filtering. (Unless someone just wants
their mail server to suddenly have massive across-the-board
deliverability issues to the large providers.)
Also, is this a feature that is built into Zimbra? Or something you
custom implemented?
(just curious)
--Rob McEwen
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