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.