How to Remove | --_=_swift_v4_1599107405_4946e79ef21876c1c26ca742b3386cf0_=_

Hi Team,
I have selected swift mailer in Settings > Common

Buy i want toremove swift_v4 from mail boundary in SwiftMailer.. how to do it ?

Content-Type: multipart/alternative; boundary="_=_swift_v4_1599107405_4946e79ef21876c1c26ca742b3386cf0_=_"

How to edit this ?
 
Where is that information stored, i can edit this ?

Which file in need to update to remove -- swift_v4 from

Content-Type: multipart/alternative; boundary="_=_swift_v4_1599107405_4946e79ef21876c1c26ca742b3386cf0_=_"
 
I have changed it myself by Doing R&D, Already.... By making a changes to File

Now i make the same as

Content-Type: multipart/alternative; boundary="_=_b1_1599107405_4946e79ef21876c1c26ca742b3386cf0_=_"

Instead of

Content-Type: multipart/alternative; boundary="_=_swift_v4_1599107405_4946e79ef21876c1c26ca742b3386cf0_=_"
 
I have changed it myself by Doing R&D, Already.... By making a changes to File

Now i make the same as

Content-Type: multipart/alternative; boundary="_=_b1_1599107405_4946e79ef21876c1c26ca742b3386cf0_=_"

Instead of

Content-Type: multipart/alternative; boundary="_=_swift_v4_1599107405_4946e79ef21876c1c26ca742b3386cf0_=_"

How do this, thanks :)
 
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