Your setting may be same as my emacs configure ,I use
1. gnus + offlineimap + dovecot + gmail + org-contacts.el
2. org-mode + xelatex May be my configure can help you
Of course it could be helpful and I thank you warmly for your email. At the moment I'm using neither offlineimap neither xelatex, but why not.
My worry of the day is to understand why, on my laptop only, I meet this error message of "smtp-server not defined"; I do not understand, and I see via Google that I am not alone...
We stay in touch, no doubt that you can help me to succeed in improving my use of emacs and LaTeX.