>which were adressed to me (that's why I can find these easily). There is 1 sec between them.
>But, possibly Sergey can account for them.

Assuming a fast double click, immediately at the first save time, could create such a situation as the message is being sent twice in the same second thus being processed in parallel. I'll see if that could be handled.

>You mean what message ? Something like "You have already submitted this message". I got it after Preview (once) and Send (once). Never saw it before and my message WAS in UT indeed (like if Preview had done it).

Can you send me the content of the message you were trying to create?