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Is your ISP blocking outgoing port 25?
- Subject: Is your ISP blocking outgoing port 25?
- From: nanog-post at rsuc.gweep.net (Joe Provo)
- Date: Thu, 18 Jun 2009 16:14:45 -0400
- In-reply-to: <01aa01c9f04c$1d0a8820$e76ed48d@zhiyunpc>
- References: <01aa01c9f04c$1d0a8820$e76ed48d@zhiyunpc>
On Thu, Jun 18, 2009 at 03:36:44PM -0400, Zhiyun Qian wrote:
> It has been long heard that many ISPs block outgoing port 25 for the purpose
> of reducing spam originated from their network.
Yes, it is standard practice for non-server accounts and most dynamic-only
accounts; only allow unauthenticated smtp traffic to your own smtp servers.
If you are not running server-to-server traffic at the end of that broadband
pipe, then you should be shifting your userbase to authenticated on the SUBMIT
port [587] anyway...
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RSUC / GweepNet / Spunk / FnB / Usenix / SAGE