Mvc how to send the email attachment with more than 20MB siz

Question

hi frnds,

I have one doubt i am trying to send email with Attchment Its done I completed this.but i could able to send more than 15MB file size

If I tr this Like this Error has come

1.Time out
2.the Page Continously loading 2 to 3 minutes without sending any mail finally am get some error


please if anybody know this tell me and share that code or share some links please help me