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Support » Email » Port 25 and Junk
Mail
Internet convention specifies that mail be
transferred using TCP/IP Port 25. That means mail servers relay
messages to each other for delivery to the recipient via Port 25.
Because spammers use that convention to send
junk mail via the recipient's mail server, Cruzio had to make changes
to protect our mail servers from exploitation.
Abuse of Port 25
is the primary way in which spam and virus zombies propagate,
so we at Cruzio see blocking as a necessary means to cracking down
on
spammers and helping to minimize the spread of viruses on the
Internet.
What changed?
Cruzio now prevents dynamic DSL customers
from sending email directly to non-Cruzio mail servers via Port
25.
All users connected to the Internet via Cruzio
may still send messages to a Cruzio mail server using port 25.
How are Cruzio members affected?
Most users
are totally unaffected by Port 25 blocking, but if you've
configured a server to connect directly to Port 25 on a non-Cruzio
mail server
or
you've set up your email
client
to do so, you won't be able to send mail until you request unblocking.
What if I use Port 25?
DSL customers with a static IP address
may request that Port 25 be unblocked for them. If you don't already
have a static IP address, please contact our Customer Service team
at 459.6301 option 2.
If you use Cruzio to connect to the Internet
and use another company's outgoing mail server to send your mail,
you should use an alternate port.
The most commonly used port is 587, but you should check with the other
company to find out what they recommend. |
