Email port 25 26 587

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Email port 25 26 587

Posted on: December 8, 2009 Category: Internet, Servers, Website Tips Comments: 4

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Email port 25 – This is the standard outgoing email port. 99% of the time it will be fine and set in your email program by default.

Email port 26 – This is simply a alternative to port 25 and works the same. It exists because some ISP’s do not allow outgoing email which we believe unless advertised bluntly is bad business conduct. So we have set up a second port for people to get around their misleading ISP’s.

Email port 587 – Is yet another attempt to block email from users. Like most spam blocking attempts blocking all ports for email other then port 587  really does nothing other then create confusion for regular users of the internet. But if you need port 587 then DWHS can open this by request.

  • KenDecember 9, 2009

    There’s a nice discussion of this at http://bit.ly/G46Pm

  • Jerry GJune 3, 2010

    I’m not very technical on this … but is this only temporarily effective? Once spam “migrates” over time to port 26 or port 587 [will it?] will this be any good? Then will they just pick a new number and start the next round?

  • KenJune 21, 2010

    No. Port 587 requires that you identify yourself to the server – something spammers can’t afford to do. If you’re interested in the details, the canonical sources on all this are a paper by the Messaging Anti-Abuse Working Group, available at http://bit.ly/157FVN and a proposal by the Anti-spam Technical Alliance that you used to be able to get at http://postmaster.aol.com/asta/proposal.html but can’t any more. If anyone knows where to find it please let us know.

  • IkeApril 6, 2012

    So ISP block email, WTF!

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