Configuration = eM Client 6.0.24928.0 + mail account “Hotmail” or “gMail” (SMTP-IMAP) + AVAST 12.3.2280
When you send an email there is 2 copies of that email saved in the “Sent” folder, one copie before avast “scan” and one copie after avast scan with the “Avast signature”.
If you uncheck ‘Save copy of sent messages in “Sent” folder’ in Tools->Settings-> Mail -> Send, there is only one copy of the sent message saved in the “sent” folder, the one after avast scan.
‘Save copy of sent messages in “Sent” folder’ checked and Avast agent OFF, no problem, only one copy of the sent message in the “Sent” folder.
Thanks to have a look to this.