a . is called a fullstops, its the end of a sentence, in which starts the next sentence that you must start with a capitol letter
eg.
I went to the toilet. I'm hungry
You should know this
perhaps you don't know what English is, some people do not end emails with full stops as their is no next sentence, this is a form of slang.
What does a 3 at end of email mean
End of Message
Australia
United Kingdom
I think it means "No Reply Neccesary".
At the end of the adress it means Poland.
very Respectfully
"SF" at the end of an email typically stands for "Sincerely" or "Sincerely yours." It is a common way to sign off formal or professional emails.
It's means hit me up...hum
TTYL means Talk To You Later.
It could be, depending on the person who wrote the email
dot-cc at the end of an email address means the domain name is registered through the grace of the Australian territory known as the Cocos Islands. Copy correspondence.