If I'm reading you right, what you are talking about here is the
fact that most ISP's now block port 25 by default, making it
impossible to set up an additional outbound (smtp) server on any
network that doesn't belong to the ISP.
You may be 100% technically correct. That sounds a little
different, than the situation I have encountered, not sure.
I was responding to this particular comment:
"The only problem that exists is that some bogus ISP's will allow you to
SEND out only on their mail server."
The comment is incomplete *and* incorrect, so it is difficult to
properly respond to, but let's see if we can clear it up below...
Nothing 'bogus' about this... in fact, any ISP that does *not*
block port 25 is, imnsho, negligent. the purpose of doing this is to
prevent spambots from flooding their networks (and the rest of us)
with junk.
Fact is many still allow me to send message to another mail server.
Maybe it is your wording...
*You* don't send messages *to* any particular mail server, the smtp
server takes care of that, using the DNS system. You *do*, however,
utilize what are called 'smtp' servers - aka, 'Outbound' or 'Outgoing'
smtp servers - for sending mail. You can have 150 different email
accounts set up in Thunderbird (or Outlook, etc), all using the same
smtp server for sending their email. You could also have a different
smtp server for each one, or only select ones.
Home users generally use their ISP's smtp server for sending email -
this is called 'relaying' - however, it isn't absolutely necessary or
required. For example, when you have a GMail account and access it using
a traditional mail client using POP, you can also choose to use their
smtp server in your mail client to send, but you will have to enable
'smtp authentication', as well as encryption (TLS/SSL) to do so. I do
believe that Gmail *only* allows authenticated relaying through port
587, but it is quite common for services like this to allow you to use
either (25 or 587).
Even some of the larger ones, hughesnet, Many DSL's, and many small
ISP's, and some of the Wireless Services that have been in operation
for 25 or more years.
So, they must solve the problems in other ways.
If they allow your computer to send *directly* with one of a few dozen
standalone smtp servers that you can install on your PC (you'd have to
know how to do this, obviously), then they are part of the spam
*problem*... no ISP should *ever* allow this to occur, except on
commercial accounts.
If it is the same problem you describe. It must not be too hazardous
or none of them would allow it.
Correct - which makes me inclined to believe that we are *not* talking
about them leaving port 25 open.
These ISP's are doing nothing but passing a packet, like a file
transfer, or what have you.
Packets are transmitted via protocols (ie, TCP/IP, SMTP, IMAP, POP,
etc), over ports. Both protocols *and* ports can be individually
blocked, thus preventing 'packets' from being sent over that particular
protocol or port.
I just set up a personality to use Fugitt.com mail server.
Fugitt.com is not a mail server, it is a TLD (top level domain). Of
course, you could install an smtp server on your private PC, host your
own domain, create an MX record like smtp.fugitt.com, and try to
directly interact with the rest of the world, but you will have limited
success - especially now, with all of the anti-spam solutions in use, as
one of their prime targets to block is botnets, and one of the primary
indications of a compromised PC is if it is a home pc - ie, using a
dynamically allocated IP address belonging to their ISP, which is what
all DSL/Cable subscribers are using.
Some ISP's allow these to pass thru and others don't.
Is that what you are addressing ?
Yes - any ISP that allows this (does not block port 25 except for their
own smtp server) is part of the spam PROBLEM...
Of course when I hit reply on a message, I can send it out to any
mail server that I select.
Again, this is poor wording - you don't send *to* a mail server. You
send *via* an smtp server - and I assure you you can't send it through
any of the ones *I* maintain - but you are welcome to try - try relaying
through smtp.media-brokers.com and see what happens...
Any mail server that accepts anonymous relays is what is known as an
'open relay', and again, is part of the spam PROBLEM. Open relays are
[one of] the bane[s] of the internet.
When a list is involved, you can use the wrong personality. And the
list software will not accept the message.
Yes - but headers are easily forged. I could easily send a message to
this mail list that *appears* to come from you.
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