In looking for any ISP's port blocking policy you should search for their 'TRAFFIC MANAGEMENT KEY FACTS INDICATOR (KFI)'. It's a voluntary code but most ISPs have 1.

Looks like SSE don't belong .

Edited by XRaySpeX (Wed 27-May-15 14:49:34)

Could that be because they are a reseller?

Could be. Had a look at Daisy, if that's who they resell. Could not find any KPI, but found these 2 relevant contradictory statements in Broadband Acceptable Use Policy:

Sharing internet access on a private network and running personal SMTP mail servers
Some methods of sharing internet access or applications expose your external internet connection to other internet users, and enable them to send unsolicited bulk emails via your computer (known as spam).

As Daisy do not block any ports it is vital that you configure your network securely, you are fully responsible for security in your own network and failure to secure it properly will result in your disconnection from Daisy services.

Setting up your mail server (open relay)
If you choose to run an SMTP email server on a private network on your premises you must ensure that it is configured correctly, so as to only accept mail from your private domain. Daisy will block access (TCP port 25), to your SMTP email server from outside of your domain to prevent it from being exploited for the purpose of sending unsolicited emails

Yes, clear as mud there.

It makes sense for ISPs to block port 25, but there should be an option to unblock if required and if it can be shown to be secure.

In reply to a post by hk11:

I'm currently with EE and they block port 25, as do AOL.

Both EE & AOL do have an Authenticated SMTP on port 587.

Believe EE only brought it in for their mobile users, who are on a diff network from the BB network, whose users can use the standard unauthenticated port 25 SMTP that is blocked to the mobile networks. It wasn't there 2-3 years ago.

Ah, yes. Daisy...

SSE do use Daisy Wholesale as far as I can tell. (Still doing some investigation on that side, lol.)

So, Port 25 WILL be blocked.

According to above post "Daisy do not block any ports"

!

On TTB with Xilo, first hop is daisy port 25 open.

Don't think it is out that is the problem, but inbound according to XraySpex.

Hi,

I stumbled across this thread while looking for an smtp solution for my father who has SSE. He says SSE had told him they do not have have an smtp server he can use.

Thanks to this thread and azrael316 in particular but also the OP for bringing it up, I have searched for a daisy smtp server and found https://daisygroup.com/resource-centre/can-tell-dais... authored by a daisy employee which stated on 27/9/13 that " The SMTP server address is as follows: smtp.daisybb.co.uk "

I have told my father but he has not let me know if it worked or not and I know it was not strictly the OP's question but I am posting here in case it helps anyone else.

Edited by ren7 (Tue 08-Sep-15 01:24:58)