change name of email

Hi, when users registration,the following mail will be sent.
It always who mail sent by

XXXXXX <[email protected]>

Where should I change the part of “XXXXXX”?

For example
The mail come like this.
I hope to change mailname2 to mailname1. where to set it?
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mailname2 <[email protected]>

Account Confirmation

Hi,

username: t0020

password: xxxxx

Activate Profile

Regards,

mailname2

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