asked on

cannot connect to any smtp server via mail client from within my network

Greetings,

Strangely i am unable to connect to any smtp server from inside my network. This is occuring since yesterday.

It is very strange, I have tested with three different smtp servers, including our isp which is comcast. I am able to ping smtp.comcast.net.

I have tried in outlook, oe and thunderbird, I get unable to connect to outgoing mail server error messages, however i can connect to the mail servers via web mail so I know they are functioning properly for both outgoing and incoming messages.

It is like something on my network is blocking the smtp connection in general. I have restarted my router and comcast modem.

This is a strange one for me.

Thanks for any ideas.

Sky

ASKER CERTIFIED SOLUTION

war1

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Schuyler Kuhl

ASKER

The thing is it is not only in one client. It is the whole network, even a laptop that is not on our domain.

My isp is comcast and usually you can just use smtp.comcast.net, I have also used our normal settings for our mail server which is hosted outside the network and also my own mail server which I use for testing, so three different and unrelated smtp servers. It is strange.

Schuyler Kuhl

ASKER

I think this is more of a networking issue.

Schuyler Kuhl

ASKER

It turns out that comcast actually had blocked our ability to send outgoing mail.

I don't know why yet but I have to e-mail some address to plead our case.

Trying on port 587 was useful though it didn't make a difference, on that port the send failed due to an authentication error.