I have just tried to send a simple but very important email with a pdf attachment for FOUR HOURS! I have used multiple browsers, updated them, cleared the caches, used my phone. Every time it just said "there has been an error". NO SPECIFICATION WHATSOEVER. What am i supposed to do there? So I changed the file. New file name, more compressed pdf, nothing helped. It is honestly a humongous disgrace that a mailprovider cannot deal with a pdf. So I went so google mail - maybe my computer was the problem all along? Or the file? But no! Sent on the first try. Shame.