Mail malfunctioning. Cannot Send. Suspect Virus. Need Help.

Mail malfunctioning. Suspect virus. Affects my Macbook and Mac Mini, not iOS devices. Mail is received, cannot send. Sending is "blocked". Also, one addressee of a message I sent was renamed by Mail with the name of an unrelated entry in Contacts. I'm running 10.10.3. Many thanks for your help.

Hi Linc,
This is what it says in the window
"Cannot send message using the server iCloud (iCloud)
The server response was: Blocked -- see **********
It's the same regardless of the addressee. Above is just one example.
Connection doctor, by the way, says all is OK in re: SMTP server.
Does this help at all?
Thanks
S
<E-mail Edited by Host>

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