Jonathan wrote:
Sorry but I disagree with Per. ISPs have a duty to prevent email Spam which is a terrible curse for us all. If they decide that blocking port 25 outbound will help then they should do it.
Just for the record - I don't have any problem with ISPs blocking ports or otherwise offering a restricted service. That is something for the ISP to decide. Where I have a problem is when such an ISP does not very clearly make people aware of this - quite often such restrictions are hidden under various obscure clauses in the AGBs.
If you are a user, why can't you use the ISPs relay server? If you are a provider you ought to have your own mail server on a fixed IP address.
In the case I mentioned, we were on a business line with a range of fixed IPs, but the blocking of port 25 was introduced over all, and the ISP refused to make exceptions, so we cancelled the line immediately (after finding a more flexible provider).
/Per