Sending Mail Affecting Internet Browsing

I've noticed a couple of times that when I'm sending large eMail messages, my Safari browser comes up with "You are not connected to the internet" messages. Now I know that when sending data it can have a slowing effect on inbound data speeds, but should this affect Safari in this way ?
Anyone else seen this?


These are the FM for sending external email :-
Send new document with attachments via RFC
(In 4.6C only, You can go to SE37 and click the documentation on how to use it. A sample program is provided there.)
Send new document with attachments via RFC
Note : If you are using FM SO_NEW_DOCUMENT_ATT_SEND_API1 then Export Parameter DOCUMENT_DATA-OBJ_DESCR contains the Subject.
Send new document
For Code