Hope someone can help me here.

I'm going to be sorting out some friends' computer tomorrow. They are on
BTinternet, and I was hoping someone could tell me they block port 25.
They have an alternative email provider and want to use the smtp server
provided by the third party.

If BTinternet do, is there any alternative port that they can use to get
round the block?

Sorry if this has been asked before, I did Google but couldn't find
anything relevant.

Cheers
Deddajay

Deddajay wrote:
> Hope someone can help me here.
>
> I'm going to be sorting out some friends' computer tomorrow. They are on
> BTinternet, and I was hoping someone could tell me they block port 25.

"They block port 25". There. I've done what you hoped!

No idea if its true tho.,

> They have an alternative email provider and want to use the smtp server
> provided by the third party.
>
SMTP is not a server protocol. Its a push protocol.

> If BTinternet do, is there any alternative port that they can use to get
> round the block?
>
only 655345 or so.

> Sorry if this has been asked before, I did Google but couldn't find
> anything relevant.
>

That's because you don't really know what you are talking about.

Is the problem sending, or receiving, mail?

In message <vYCdna99lvWn28PXnZ2dnUVZ8oadnZ2d>, Deddajay
<news> writes
>Hope someone can help me here.
>
>I'm going to be sorting out some friends' computer tomorrow. They are on
>BTinternet, and I was hoping someone could tell me they block port 25.

I could tell you that they do, but they don't.

On 15/07/2009 in message <vYCdna99lvWn28PXnZ2dnUVZ8oadnZ2d>
Deddajay wrote:

>Hope someone can help me here.
>
>I'm going to be sorting out some friends' computer tomorrow. They are on
>BTinternet, and I was hoping someone could tell me they block port 25.
>They have an alternative email provider and want to use the smtp server
>provided by the third party.

Have a look at this:
http://btyahoo.com/smtpnonbt

"Jeff Gaines" <jgaines_newsid> wrote in message
news:2001
: On 15/07/2009 in message
<vYCdna99lvWn28PXnZ2dnUVZ8oadnZ2d>
: Deddajay wrote:
:
: >Hope someone can help me here.
: >
: >I'm going to be sorting out some friends' computer tomorrow. They are
on
: >BTinternet, and I was hoping someone could tell me they block port
25.
: >They have an alternative email provider and want to use the smtp
server
: >provided by the third party.
:
: Have a look at this:
: http://btyahoo.com/smtpnonbt
:
:

Thanks for all replies - albeit some tongue in cheek :))

Sorry, I'm tired, so I probably didn't explain myself very well.

I gather BTinternet do not block port 25, so if my friends have the
alternative provider's details, I should be able to set them up to send
via the third party provider.

If I've got it wrong, I'm sure someone will tell me.

Cheers
Deddajay

In uk.telecom.broadband, on Wed, 15 Jul 2009 23:54:18, Deddajay wrote:

>I gather BTinternet do not block port 25, so if my friends have the
>alternative provider's details, I should be able to set them up to send
>via the third party provider.

The third party provider should be able to tell you what alternative
ports they acknowledge. You might have to set up SMTP-AUTH though, or
use SSL, or both.

Deddajay wrote:
[..]
> Thanks for all replies - albeit some tongue in cheek :))
>
> Sorry, I'm tired, so I probably didn't explain myself very well.
>
> I gather BTinternet do not block port 25, so if my friends have the
> alternative provider's details, I should be able to set them up to send
> via the third party provider.
>
> If I've got it wrong, I'm sure someone will tell me.
>
Generally you either send via your ISP's relay - in this case BT - or
via whoever hosts your email domain, using authenticated smtp with a
password.

No ISP blocks outbound port 25..or you couldn't reach THEIR mail relays.
If you cant send mail, it ain't much use as an ISP. If they only let you
access their mail relay, well that's OK: Use it.

They may possibly block incoming SMTP onto non fixed IP address domains
tho. But that's what POP and IMAP are for..

In article <h3lp6c$mpf$1>, tnp says...
> Deddajay wrote:
> Generally you either send via your ISP's relay - in this case BT - or
> via whoever hosts your email domain, using authenticated smtp with a
> password.
>
> No ISP blocks outbound port 25..or you couldn't reach THEIR mail relays.
> If you cant send mail, it ain't much use as an ISP. If they only let you
> access their mail relay, well that's OK: Use it.
>
> They may possibly block incoming SMTP onto non fixed IP address domains
> tho. But that's what POP and IMAP are for..
>>
I think blocked was used in the sense that you have no option but to use
the ISPs server.

Freeserve used to 'hijack' port 25 and any SMTP request would be forced
on to their mail server and not the intended one.

"Mugwump" <mugwump> wrote in message
news:96d7
: In article <h3lp6c$mpf$1>, tnp
says...
: > Deddajay wrote:
: > > "Jeff Gaines" <jgaines_newsid> wrote in message
: > > news:2001
: > > : On 15/07/2009 in message
: > > <vYCdna99lvWn28PXnZ2dnUVZ8oadnZ2d>
: > > : Deddajay wrote:
: > > :
: > > : >Hope someone can help me here.
: > > : >
: > > : >I'm going to be sorting out some friends' computer tomorrow.
They are
: > > on
: > > : >BTinternet, and I was hoping someone could tell me they block
port
: > > 25.
: > > : >They have an alternative email provider and want to use the
smtp
: > > server
: > > : >provided by the third party.
: > > :
: > > : Have a look at this:
: > > : http://btyahoo.com/smtpnonbt
: > > :
: > > :
: > >
: > > Thanks for all replies - albeit some tongue in cheek :))
: > >
: > > Sorry, I'm tired, so I probably didn't explain myself very well.
: > >
: > > I gather BTinternet do not block port 25, so if my friends have
the
: > > alternative provider's details, I should be able to set them up to
send
: > > via the third party provider.
: > >
: > > If I've got it wrong, I'm sure someone will tell me.
: > >
: > Generally you either send via your ISP's relay - in this case BT -
or
: > via whoever hosts your email domain, using authenticated smtp with a
: > password.
: >
: > No ISP blocks outbound port 25..or you couldn't reach THEIR mail
relays.
: > If you cant send mail, it ain't much use as an ISP. If they only let
you
: > access their mail relay, well that's OK: Use it.
: >
: > They may possibly block incoming SMTP onto non fixed IP address
domains
: > tho. But that's what POP and IMAP are for..
: >
: > >
: >
: I think blocked was used in the sense that you have no option but to
use
: the ISPs server.
:
: Freeserve used to 'hijack' port 25 and any SMTP request would be
forced
: on to their mail server and not the intended one.

Thank you, Mugwump, that's exactly what I meant.

Cheers
Deddajay

Deddajay wrote:
> "Mugwump" <mugwump> wrote in message

> : I think blocked was used in the sense that you have no option but to
> use
> : the ISPs server.
> :
> : Freeserve used to 'hijack' port 25 and any SMTP request would be
> forced
> : on to their mail server and not the intended one.
>
> Thank you, Mugwump, that's exactly what I meant.
>
> Cheers
> Deddajay
>

In that case, the answer is no, they don't. I have already changed an
SMTP address for a customer. Both that ISP and BT used port 25 and it
worked perfectly.

On 15/07/2009 in message <MOydna1lBf-vw8PXnZ2dnUVZ8jidnZ2d>
Deddajay wrote:

>I gather BTinternet do not block port 25, so if my friends have the
>alternative provider's details, I should be able to set them up to send
>via the third party provider.

I don't think anybody blocks Port 25 but some ISPs will only allow the
sending of email if the 'from' address is one of their valid email
addresses.

I had to help several people set up email using a community email address,
my notes say:

Some ISPs may block access to third party SMTP servers as a SPAM
prevention measure.
If you find you cannot send email from your damerham.net account then you
should change the SMTP server port in your email software from port 25 to
port 587. This can be found under the Advanced tab in Outlook Express. It
is also usually a good idea to tick the “My server requires
authentication” box.

The link I gave in my earlier post gives specific instructions for BT Yahoo.

I've missed some of this so may be wide of the mark, but the bits I can
read I've taken the bloody liberty of adding some remarks too. Not to be
rude or 'clever' just as a FYI:

>
>>I gather BTinternet do not block port 25, so if my friends have the
>>alternative provider's details, I should be able to set them up to send
>>via the third party provider.
>
> I don't think anybody blocks Port 25 but some ISPs will only allow the
> sending of email if the 'from' address is one of their valid email
> addresses.

1. Verizon do (but they are in the USA)
2. It is a bit more complex than offering a correct 'rcpt from'. There
will be SASL at the least and possibly an IP based ACL to content with to
relay out via an ISP mail server
>
> Some ISPs may block access to third party SMTP servers as a SPAM
> prevention measure.

That should read 'the majority of the world will block mail from a
community server' if;
a. It has an IP address that falls inside a dynamic range
b. Has no PTR record in DNS or other dns irregularities
c. Has hostname or protocol issues.

Be very aware that with over 90% of email being junk, you can't just set
up a server at home and hope it will work on a BTInternet Ip address.

The good news is with a static IP in an properly allocated static IP
range from BT, you can easily set something up with a little know how.
However, should you start firing of mailing lists or other trash that is
considered 'bulk' or 'unsolicited' the last of your worries will be the
various block lists that snub you out. The issue will be BT terminating
your account without warning.

I watched a guy buy a mailing list program so he could do some
'marketing'. He managed to output just over 1000 messages. That's really
lame for UCE. Of which about 8 made it into a server and I suspect most
of those then fell into 'junk' folders. That afternoon BT Pulled the plug
on him and held him to his contract term. Moral, be **VERY** careful with
what you do as far as email goes in the UK.
[..]

On Thu, 16 Jul 2009 08:44:43 +0000, Jeff Gaines wrote:
>
> I don't think anybody blocks Port 25 but some ISPs will only allow the
> sending of email if the 'from' address is one of their valid email
> addresses.

Which BT certainly did, a few years ago (in other words, I'm not
promising that they still do)

This could be why OP wanted to use $OTHERISP's mail relay. I've set that
up for someone with btinternet (because of the first-mentioned problem)
and it worked fine. $OTHERISP's mail relay needed authentication, of
course.