[ferrety]

Originally Posted by BritTim

Usually, the best way of figuring out the sieve code for something that can be done using a Rule is to

• Create the Rule
• Go to Edit custom sieve code (see bottom right of the page)
• Find the sieve code associated with the Rule you just created.
• Copy the code.
• Cancel to exit from Custom Sieve and delete the Rule you created temporarily.

Doing this for your problem, you get

if 
  allof(
  address :is ["To","Cc","Resent-To","X-Delivered-To"] "MyAlias@MyDomain.com",
  header :matches "X-Mailer" "MailChimp Mailer*"
  )
{
  discard;
  stop;
}

Hi Tim
Really appreciate your knowledge here
Will the script I wrote fail, if so what about it have I messed up. Again forgetting aliases (so as to make it less complicated)?

PS I signed up for a free mailchimp account (giving the spammy gits no private info) I used an alias email & sent my self test emails while fiddling with sieve script. To test if my script was stopping them.
It only started stopping them when I set it like below

if header :contains ["X-Mailer"] ["MailChimp"]

{discard; stop;}