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Port 25 blocking
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Do all ISPs block port 25 for outgoing email via another service provider's outgoing email server?
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That is an interesting question. Port 25 is not completely blocked as one can send mail via smtp. However, I have found that I can only send mail if it is going to my isp's email server. ie, I cannot send mail to mail.freeserve.com as I am with ntlworld. I guess they restrict smtp traffic to some IP addresses. So, I would say, yes they probably do.
No. Freeserve do (all outgoing connections to port 25 get forwarded to the freeserve SMTP server from what I remember). I'm with virgin now, and they don't seem to 'block' it. For security reasons, I think Freeserve's heart is in the right place. But it's a pain when you're running your own SMTP server....
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