Impact of changing the local-part of sender email address

[Mike_Bevan]

We are considering changing the local-part of our sender email.  We will keep the domain that same.  Do we need to "warm" the new email address?

[SanfordWhiteman · Accepted solution]

Don't worry about warming, but if any recipients have deliberately added an exception for marketing@example.com they will not have an exception for mktg@example.com.