Just read through this thread. Thought I might add this solution.
Had a problem with a customer trying to use scan to email from ricoh using gmail. Intermittently working. Customer I.T. blaming photocopier of course.
Having read another thread here some time ago that suggested using gawab.com when you need an smtp server. I can verify that this works and is very handy to prove to an I.T. twat that there is nothing wrong with photocopier.
Just go to
www.gawab.com set up an account. Use psmtp.gawab.com as smtp server. Turn authentication on and use user name and password that you used to set up email address. Port 25 or 587.
Thanks to original thread that provided this alternative.