What is the purpose of the message? Maybe you can send a message instead to a central server (e.g. via a UDP packet to a particular port), do some validation on that message (perhaps with public key cryptography) and have the central server send the email for you?
On Sun, Mar 4, 2018 at 12:35 PM, <t...@wescottdesign.com> wrote: > Thanks John. You've kind of summed up what I know -- at least I know I have > it right. > > Need to think of how to make it work as you said, without burdening any > non-technical people with too much work. > > > On 2018-03-04 11:51, John Meissen wrote: >> >> Sending email is easy. The device simply connects to the MX host for the >> destination (specified in the destination domain's DNS records) and hands >> off >> the email. >> >> The problems arise when ISPs block outgoing connections to port 25 (to >> mitigate >> spam from compromised systems inside their network) and when mail servers >> block >> incoming connections from sources such as dynamic IP addresses, typically >> home >> Internet service, etc. >> >> The only way around those issues is to route the email through a trusted >> source, such as authenticating with the ISP's mail server or the product >> manufacturer's hosted system. >> >> t...@wescottdesign.com said: >>> >>> >>> If I sold you an IoT device that sent email, how would you want it to do >>> so? >>> >>> I'm looking for the ideal compromise between minimum work programming >>> the thing, reliably getting emails to people who need them (i.e., not >>> getting caught in spam traps), and not asking the IT people at the >>> organization where the thing is installed to poke Great Big Holes in >>> their firewalls. >>> >>> The command: >>> >>> echo I can send mail from the Linux command line! | mail -s "This is a >>> mail message" -t timwesco...@gmail.com >>> >>> works when the underlying mail system is configured to claim that it's >>> sending from t...@wescottdesign.com -- but (A) if I send it to >>> t...@wescottdesign.com it gets caught in a spam trap at a low enough >>> level that I can't even find it in my filters, and (B) it just seems too >>> easy. >>> >>> This is all with the heirloom-mailx package in Ubuntu 16.04. >>> >> >> >> _______________________________________________ >> PLUG mailing list >> PLUG@pdxlinux.org >> http://lists.pdxlinux.org/mailman/listinfo/plug > > > _______________________________________________ > PLUG mailing list > PLUG@pdxlinux.org > http://lists.pdxlinux.org/mailman/listinfo/plug _______________________________________________ PLUG mailing list PLUG@pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug
