|May 28, 2008
Some ISPs (Internet Service Providers) block port 25 because they are
concerned that spam can be relayed through this port. Your SMTP (Simple
Mail Transfer Protocol) email setting may be using this port. There are
a couple of situations where this can cause you problems.
- If you maintain your own domains and use a webhost separate from
your ISP, and if you use an email program such as Outlook to send
your email, there may be a conflict between your webhost email port
settings and your ISP ports allowed. One way to resolve the conflict
may be to contact your ISP. They may unblock the port if you make
your request in writing.
- If you are using a public network, such as at a hotel, the
public network may block your email SMTP port. In this case you
obviously won't be able to request that the ISP unblock the port.
Instead, contact your email provider. They likely have an alternate
email server port for use. Consult your email software for
instructions on how to set the SMTP port.