Attachments encoding using methods like Base64 or UUencoding are typically much larger than the original files, and there's nothing unusual about . It's just the way e-mail works.
If you're concerned about the files being as big as they are, you really need to look at where it's happening: on the client, not on the server.
Zoran Kikic wrote:
hmm ok but a 2.13 MB binary attachment become 2.98 MB big in IMAP
mailbox! I think 1/3 of the original mail (attachment) is somewhat too
much. I sent the mail from a FreeBDS client. It looks like every mail is
3x bigger!
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