In Mac OS X for the Traveler, Part 5 François Joseph de Kermadec provides a useful tip for sending email if you can’t access your normal SMTP server. [Via Meerkat: An Open Wire Service: MacDevCenter.com.]
I’ve struck this problem when I’ve used Wellington’s CafeNet service which blocks Port 25. I can send email via a web interface, but not via Eudora. Kermadec says:
Indeed, many hotels and Internet Service Providers now block ports associated with SMTP requests in order to prevent (so they say) spam and viruses from propagating on their networks. Unfortunately, this means that they also prevent you from using your usual email account, unless your provider allows you to connect to the SMTP server on a non-standard port–which is quite uncommon.
Therefore, if you can afford it, you may want to get an SMTP-only account, specifically designed for travelers and users in your situation. DynDNS is a known provider of such services–and their servers support SSL, which is a huge plus!
For a yearly fee of about US$15 you can send up to 150 relays per day (in simple terms, a relay is one message to one address), which seems incredibly reasonable to me and which should be more than sufficient for ordinary email use. I don’t often travel myself and haven’t tried out this service. I often need to advise clients though on such things. If you’ve used the service please let me know (in the comments here) how you got on.