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  • port 25 has been closed by isp's for a long time, most have moved to 587. noip.com/blog/2013/03/26/…
    – Moab
    Commented Dec 21, 2015 at 1:49
  • I've seen it and that's why I said, "but the final solution offered is a paid commercial service"
    – xpt
    Commented Dec 21, 2015 at 2:28
  • @moab Port 587 can be used for submitting email to an SMTP, but not (in the general case) for sending email between SMTP servers as the OP is needing to do.
    – davidgo
    Commented Dec 21, 2015 at 3:14