On 2022-08-16 at 12:30 +0200, Jaroslaw Rafa wrote:
> Dnia 16.08.2022 o godz. 12:22:55 Andre Klapper pisze:
> > On Tue, 2022-08-16 at 12:19 +0200, Jaroslaw Rafa wrote:
> > > There is one more valid reason to use POP: if you have a main mail account
> > > (A) and a secondary one (B), and you want to have all messages from 
> > > account
> > > B forwarded to account A, but account B doesn't allow to configure
> > > forwarding.
> > 
> > That resembles http://www.xkcd.com/1172/
> 
> You may laugh, but many people actually do use this.
> 
> This is even recommended by some "deliverability specialists" as a better(!)
> alternative to forwarding (especially to Gmail), because forwarding breaks
> SPF (or SPF breaks forwarding - it depends how do you view that issue) and
> sending a lot of messages with failed SPF may decrease the reputation of the
> sending server on the receiving end.

Well, even if you are able to forward account B to gmail account A,
Google may decide to reject a portion of those at SMTP time, so the
"solution" is to point account A to *also* fetch the emails from B
through POP, so they end up downloaded in that other way.
Corporate version does have an option to trust a sender MTA as part of
your organization (at the org level, I think), but normal users have to
use this kind of duct tape. 

For extra fun: Gmail will also perform "SPF checks" on those POP-
downloaded mails and decide on whether they are spam or not based on
the (sometimes quite wrong) IP addresses it guesses…


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