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So over the past few years Comcast has updated security measures in the POP3 email server. Some of these updates look to be directed at 3^rd party email software end users like to fetch their mail off the Comcast server.So they have sent out notices regarding "work arounds" for the issue of getting an error response "authentication needed". Now please note folks like every other ISP Comcast does not guarantee or support 3^rd party vender software you obtain with your PC or have purchased anywhere but from Comcast.
3^rd party would be anything that the ISP does not maintain or have rights to that an end user "YOU" have purchased from another software vender.The original setup for 3^rd party email clients "Outlook mainly" which used to be supported in years past was:
Incoming-mail.comcast.net
Outbound-mail.comcast.net
Now the incoming has remained the same throughout however outbound has changed a couple of times to smtp.comcast.net. So recently I seen the new outbound they wanted changed to imap.comcast.net
So I tried this and it just didn't work and I went back to the smtp.comcast.net. Here as of today I realized my outbound again stopped working. So what has happened now the server wants to look at your user name and password a second time as well the outbound listening port which always worked on port 25 now likes port 587.
Here are the steps to make these changes to your Outlook email client.
Open your Outlook click "tools" then "account settings" click on your email address your using for Comcast. Bottom right click "more settings" click "outgoing server" click the tab that says "My server (smtp) requires authentication" click "log on using" fill in the user name and password for your Comcast account minus the @comcast.net it does not need your email routing extension here.
Now click OK and go back in the same way you just did except instead of clicking the "outbound server" choice the last tab that says "Advanced" The only thing your going to change here is the "outgoing server (smtp)" from 25 to 587. Click ok and that's it your done.