Cannot send nor receive mail

[syrose]

My mailbox was flooded with spam, pornographic ads that were worsened
by a bug (?) that re-sent the same mail 3-4 times to the same mail recipients.
I downloaded and installed/run a trial-ware anti-spam software.
From that moment, I could receive no mail at all.
Un-installing the offensive software did not help and the “Go online” in “Mailbox” reverted immediately to “Off-line”.
In one of the Mac/help/for "newbies" like myself/forums, I was advised to trash the “com.apple.mail.plist” and restart the computer.
I did exactly that. This however, changed my e-mail address from syrose@netvision.net.il to syrose@mac.com.
(I don't mind and even like it).
However, this e-mail address does not accept/recognize my password so I cannot receive mail.
At this stage, none of my e-mail addresses is functional.
I also please, please need genuine advice to help me to:
(i) Regain access to my previous (hopefully still
functional) e-mail address.
(ii) Retrieve/import previously received and sent mail.
Please, I am lost and need step-by-step instructions.
I apologize if you receive this mail more than once.

 

[Veldek]

I think the problem here might be that after you trashed the preferences, you had to re-enter your account info. What you didn't notice is that you had to select which kind of account you wanted to create. It is preset to a .Mac account, so when you entered your data, it created a @mac.com adress.

Check your account and set it to POP or whatever you use.

Just an idea...

 

[syrose]

Just to say thank you.
The "issue" is currently examined by the local Internet
Provider Service.
So I better wait.
Thanks once again