I noticed when you forward a mail with attachment - either by 'forward' or by drag n drop into composer, the attached documents got doubled: So a mail of say 5 MB shows up in the outbox as 10 MB. This can extend the max mail size of your ISP, although the original mail would fit from size. Reproducible: Always Steps to Reproduce: 1. see above 2. 3.
Created attachment 91371 [details] Example Mail Note that the problem occurs as well sith signed mails. There you can see that the mail size is 34 MB, although the attachment is 'only' 17MB
Created attachment 91372 [details] original size of attachement This shot showss the original size of the attachement KDE is 4.14.4
Just signing an email with an attachment using PGP/MIME results in the duplicate size as well. The attachment then exists twice in the source of the email. KMail 4.14.9
This probably happens because the mail gets encoded (base64): E-Mail used to be and probably still is 7-bit, hence size doubles. This is not a bug, see RFC 5322, 2.3.