you can always use a purchased smtp server account. i use fastmail.fm to clean my mail, and give me an smtp server that i can use anywhere anytime i have internet access. i travel a lot i can't be tied to the smtp for whatever isp i am using.
fastmail also has tremendous mailkeeping capabilities, its my secretary as well. multiple configurable auto responders, filing, spam removal and configuration, have some put into a maybe spam folder, others not.....
i couldn't work nearly as efficiently without fastmail. its the best $3us i spend every month!!!!
i worked for a company for awhile that had 70 traveling users. all i setup using a single fastmail smtp account. ended all the troubles with finding out the smtp server for whatever hotel various folks were in etc....