Port 25 blocked outbound?

here is a list of blocked ports on the Comcast network:

http://businesshelp.comcast.com/help-and-support/internet/ports-blocked-by-business-class-internet/

At the bottom, you'll see that occassionally, port 25 will be blocked due to spam. It appears you can call 1-877-807-6580 if you are running a mail server, and i would imagine COmcast would remove the block.

Hello Doc and welcome,

Yes, Industry (including Comcast) now blocks port 25 due to a recent major hacking incident. As a result your email outgoing server can be re-programmed to either port 587 or 465.

Hope this heps you out.

have you tried calling the number I mentioned in my post earlier in this thread? According to that Comcast page that lists all the blocked outgoing ports, you can call that number and request the block be removed.

So we have been using port 25 for outbound traffic on our HP CM2320nf Multi function printer for several years and today it seems that all traffic has been blocked?

We can not use any port that requires authentification of username and password as the HP laser printer does not give you any option for that, when i put in port 587 the devices says it passes the smtp gateway test but as soon as you try to send anything it fails to connect, presumably because the HP cant provide the authitification credentials.

Short of buying a new MFP device what can be done, is there other open ports, other solutions? We use this device daily in our business and any help is appreciated

THANK YOU - for that, i just got off the phone - they reprovisoned the modem and we are back up.

thanks for providing the number and beating me over the head with it - LOL