On Thu, Jun 23, 2022 at 05:46:50PM +0530, Burn Zero wrote:

> Thank you all and to Wietse Venema. You are right, the issue is with
> the client email system. When checked in their system, the email size
> is 17 MB and while exporting and saving that message, it becomes
> around 47 MB.

Perhaps some naïve user or mail user agent is choosing quoted-printable
rather than base64 for encoding large binary attachments.  That would
tend to produce roughly 2-3x expansion, because non-ASCII octets encode
to 3 bytes (=nn hex encoding).  With base64 the expansion is only ~35%.

-- 
    Viktor.

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