I haven't followed this thread a while, so maybe someone has already suggested this; but it would be useful to have multiple smtp-servers configured optionally to the settings.

For example, in my country there is basically just three GSM operators which all have their own smtp-servers, which allow only send email if you come from their own network.
So, if the phone is stolen and used in my country, pretty likely the new SIM card will be connected one of the 3 networks, so having all three different smtp-servers configured would be a good thing.
smscon would just try all the smtp servers in the configuration until with one of them it succeeds to send the email.

(And I still think, smscon should have separate SMS password which is used to check quickly and battery efficiently if the income SMS message is meant for smscon; if the first word in sms is the password, process futher, otherwise stop there. Would also simplify things in smscon-editor alot.)