Outgoing mail size

Hi all,When i send a email with a 2,5Mo attachment file to a internet address, then on the client the size of this email is up to 4 Mo !!!

can you help me please !!

Mick

Subject: Outgoing mail size

this is because the att is recoded in base64

Subject: RE: Outgoing mail size

My attachment is encoded with QuotedPrintable in my server document.