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Why should I use port 587?
In an attempt to control unsolicited email (spam), some Internet service providers will block port 25. All email sent via the Internet is routed through port 25, the port used for communication between an email client and an email server. Port 25 blocking allows ISPs to block spam sent out through their networks. If you are experiencing technical difficulties when sending via your email client (such as Outlook), then your ISP may block port 25. For these cases, you will need to change the SMTP port from 25 to 587 in your email client.
If this is not what you needed to know, check out our Online Help Desk. Visit it any time by logging into your Yahoo! Mail account and clicking on the "Help" link located in the upper right-hand corner.
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