Re: Why use an email client AND sendmail/popa3d - Does this avoid the hijack?
On Wed 25 Nov 2020 at 00:08:27 (+0000), mick crane wrote:
> On 2020-11-23 12:19, Andrei POPESCU wrote:
> > On Lu, 23 nov 20, 14:27:36, Keith Bainbridge wrote:
> > > I was interested to read that Flo, the OP, uses separate mail
> > > collection, sendmail and thunderbird. Some of the replies sound like
> > > this is a common practice.
> > >
> > > What are the advantages of this set of processes over letting tbird do
> > > it all? - or any other client for that matter?
> >
> > It makes it easier to switch between different e-mail clients if the
> > sending and/or receiving is handled externally, e.g. one might use a
> > graphical e-mail client in general and a text mode client occasionally.
> >
> > Such a setup also typically uses standard locations for the storage (as
> > opposed to e-mail client specific), which makes it easier to add more
> > functionality (e.g. serve local e-mail via IMAP) or replace individual
> > components.
>
> As I can make out if you try to do the useful stuff on your home network
> like having Dovecot doing your mail it is really a bodge if you are
> not advertising those services on the internet.
Apart from any security considerations, you'd need to be running your
server 24/7 if it's going to receive mail from random MTAs across the
globe. We run our modem and routers 24/7 (and my old modem burnt out
recently after 7 years) but I'm not prepared to run my old computers
like that.
> I am I suppose in the domain of Sky who provide my wired connection so
> I use sky/yahoo SMTP server as part of service but they add to
> outgoing email "Reply-Path" being my Sky user account in the headers
> which seems to be confusing exim email lists and results in rejected
> or bounced emails recently.
We only see the accepted emails, of course, and I can see that you
changed something late last year in the way you submit your posts.
I'm not sure why that change would cause rejection or bounces.
I had to make a similar change more recently. Submitting to my ISP
now necessitates using an ISP account as the Envelope-from in order to
authorise a submission (even though the connection has already been
authenticated with the same ISP account *and* password). That works
fine at home, though it's untested when travelling.
> I'd like to sort it out to avoid that if I knew what they were doing.
> I like things as they are when it is working and really, really don't
> want to go the whole hog of advertising email services. I think it is
> some relatively new thing where they are double authenticating or
> something but ideally I don't know why SMTP server does just pass
> message along and not add items to the header except they received it
> and passed it along to the recipient.
Perhaps the problem is similar to the one I had with this list
(hence the change I made above). What happened was that my posts'
Envelope-from (set to the same as my From address above) was being
changed by my mail hosting service to an address on their outgoing
mail gateway. AIUI Debian immediately tries to establish an email
connection to that address on port 25 to verify it exists, but the
outgoing gateway apparently is not an incoming mail receiver, and
is not listening on port 25. So Debian rejects the post.
Hence my change in mail submission for this list, from using my
email hosting service to my ISP instead.
What sort of rejections and/or bounces have you had?
Cheers,
David.
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