Old but new Q: Cannot send email from Mac Mail application but computer tells me I'm online

I know this is an "old" issue for many, but I cannot find the solution to my problem.
A couple of months ago I moved to a new flat--suddenly I could not send emails anymore from my Mac Mail app, although I could receive them. I called Comcast, my Internet provider, who said it was my email server's problem. My email server is icloud, so I talked to a Mac tech guy who did remote desktop troubleshooting and said everything was set up correctly, etc., so I will have to talk to Comcast again. I called Comcast again and they told me again, it is not their issue.
So this is what happens: When I try to send an email, I get the spinning circle in the mailbox bar, and then it tells me after five minutes of spinning that icloud is offline. However, when I do a further check of the diagnostics, the light is green and says that yes, in fact I am connected/online. Note: I can send and receive fine on webmail, but I do not want to keep using webmail at home. It is very inconvenient.
I called Mac support again, and they told me I should find my solution online; otherwise, I can pay $20 to have someone remotely troubleshoot for me. Of course, I could not find the answer online. I am quite frustrated and annoyed at this point. Is it a port issue? Is it an OS issue? Mind you, I only have this problem at home, nowhere else. I take my laptop to a café, to a friend's place--I can send emails just fine. This leads me to believe that it's a Comcast issue, although they deny it.
Any thoughts would be deeply, deeply appreciated! Thank you!!

How about some free much-needed advice on how I can
start receiving emails again!
This indicates you were able to receive email with
your Verizon account previously with the Mail.app?
If so, try running Keychain First Aid on your login
Keychain.
http://docs.info.apple.com/article.html?artnum=151548
Open Keychain Access, located in
Applications/Utilities.
Choose Window > Keychain First Aid.
Select your login Keychain, enter your password,
select Repair and then Start.
This is Trevor from the first post and I figured it out:
Go into mail - preferences - and delete the email account in question - the window will tell you that you'll lose all your saved mail, etc - you can save it if you like.
Then click on yes and you create a new mail account using your same incoming/outgoing settings. And, like magic, it works!
Try it - and if you want to save any mail before deleting your affected account, do it.
All the best!
Trevor "

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