Missing emails

[#1]

All of a sudden the pathetic spam disappeared along with all my incoming and out going emails
I sent some to myself to test the system to see if they would arrive at their destination ~ nothing. 
Some were quite urgent
How can I retrieve them?
Joanne
my surname is Koffman
you can em me by using my 1st name
then at
then my surname
at dot co dot uk
written like this to avoid spammers

[#2]

I, too, have been delighted to see the bulk of the spam disappear.
BUT
I understand that I have been sent four emails between 18 and 29 Feb, confirming an order I  placed for something on the internet.  None of these has reached me.
Do I have the facility to see what has been automatically deleted by the new PlusNet system over the last week or two?  I know which dates these important emails were sent on.
Angela

[#3]

@angelab
If you have spam filtering turned on, and directed to send spam to your webmail spam folders, you will need to check these for genuine mails wrongly tagged as spam.
The problem for the Original Poster looks more difficult than this.  Are you sure about the address(es) your sending to, and using the right mailbox name(s) to access them?