Sending & receiving mail problems in Yosemite

Question

I have had continuous problems wt my Comcast mail for months now. The problem started after I did a clean install of Yosemite. My mail settings, and passwords are all correct. I used connection doctor, and it said that I had two Comcast.net smtp accounts. One was green, while the other was red. I'm quite sure that I only have one, that I set up, but still deleted my Comcast mail account, hoping that this would remove the offending account. I removed it, and checked connection doctor again. It still says trying to log in to this Comcast SMTP account failed. Verify that the username, and password are correct. This is really confusing me, because I no longer even have a Comcast account account, even set up in mail. I am guessing that the extra offending Comcast account is to blame, but I can't seem to locate or delete it from my mac. Any ideas why I can't Comcast to work?

Answer 1

I believe I fixed the problem wt some internet searching, and help from above. I read on another site, that sometimes if you have multiple passwords in your keychain for mail, it can cause problems. I checked my keychain, and sure enough, I had 3 different passwords, set up for my dektop mail account. One of them, was the password, that Comcast had changed my email too, when I had called them previously about the problem. I had changed it back, but the older one in the keychain was still inadvertently taking control. I removed all of my desktop mail  login from the keychain, deleted all email accounts in my mac for good measure, and then added them again. I changed my password also through Comcast, from the goofy one they chose. So far all of my mail accounts are working A-Ok. Should I have removed the older passwords from my keychain? I change online email passwords occasionally, on the Internet, but never had a problem wt my keychain mixing up passwords before.