I'm using David InfoCenter as email Software, and I have troubles with some of my emails in Russian. It's only a few letters, in some emails (sent from different people), like for example the "R" ("P" in russian) will be shown as a "T". In other emails in Russian, the problem doesn't appear. Isn't it strange? Does anyone had the same problem already and found where it came from?

When I transmit that email to an external mailbox (internet email account), it's even worse, and gives me symbols instead of all Russian letters...

The default encoding was "Russian (ISO)", I changed it to "Russian (Windows)", but same problem. Another weird reaction is when I write an intern email and name it TEST in Russian (????), with ???? in the text window, it changes the title to "Oano"? But the content stays in Russian...

With Mailinator I got the following, for message and subject "????":

Subject: ????
[..]
MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="----_=_NextPart_000_00017783.4AF7FB71"
This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.
------_=_NextPart_000_00017783.4AF7FB71
Content-Type: text/plain;
 charset="utf-8"
Content-Transfer-Encoding: base64
0KLQtdGB0YI=
------_=_NextPart_000_00017783.4AF7FB71
Content-Type: text/html;
 charset="utf-8"
Content-Transfer-Encoding: base64
PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9uYWwv
L0VOIj4NCjxIVE1MPjxIRUFEPg0KPE1FVEEgaHR0cC1lcXVpdj1Db250ZW50LVR5cGUgY29udGVu
dD0idGV4dC9odG1sOyBjaGFyc2V0PXV0Zi04Ij4NCjxNRVRBIG5hbWU9R0VORVJBVE9SIGNvbnRl
bnQ9Ik1TSFRNTCA4LjAwLjYwMDEuMTg4NTIiPjwvSEVBRD4NCjxCT0RZIHN0eWxlPSJGT05UOiAx
MHB0IENvdXJpZXIgTmV3OyBDT0xPUjogIzAwMDAwMCIgbGVmdE1hcmdpbj01IHRvcE1hcmdpbj01
Pg0KPERJViBzdHlsZT0iRk9OVDogMTBwdCBDb3VyaWVyIE5ldzsgQ09MT1I6ICMwMDAwMDAiPtCi
0LXRgdGCPFNQQU4gDQppZD10b2JpdF9ibG9ja3F1b3RlPjxTUEFOIGlkPXRvYml0X2Jsb2NrcXVv
dGU+PC9ESVY+PC9TUEFOPjwvU1BBTj48L0JPRFk+PC9IVE1MPg==
------_=_NextPart_000_00017783.4AF7FB71--