The department’s SMTP relay, gateway.EECS.Berkeley.Edu, accepts incoming connections on the SMTP Submission port (port 587).

Most of the major Internet Service Providers (ISPs) are now blocking or filtering the default SMTP port (25) at their network borders, making the use of gateway.eecs impossible for some home users. Those who are being affected by their ISP’s blocks may find relief by using this alternate port 587.

See the IRIS Software FAQ for instructions on how to configure your email client.

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UPDATE

[2005-03-23 11:17:29 | Yi Ding, EECS Helpdesk]

SBC has a webpage about it’s port 25 blocking including a link to opt out at http://help.sbcglobal.net/article.php?item=4640 .