SMTP dot stuffing.. when and where to do it?

Question

I have found conflicting information about dot stuffing when transmitting an email.

1. stuff a dot if the line contains a single dot (to avoid premature termination)<

Answer 1

In SMTP protocol the mail is terminated by a single dot and a newline character(s)

In simple terms something like:

\r\n.\r\n

The characters:

CR LF DOT CR LF

Which corresponds to a single dot at the beginning of a line.

In case the mail data contains a single . At the beginning of line and is followed by a new line character then the SMTP protocol will consider it as mail termination and hence only a part of mail would be delivered.

So the whole idea is to avoid these type of situation by padding an extra dot.