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Some newsletter mails aren't delivered

amkay opened this issue · comments

commented

Hi!

I configured my mailbox to reject mails that are delivered via unencrypted SMTP connections and I think also TLS encrypted SMTP connections with weak ciphers.
Since then only some newsletter mails were delivered to my inbox, all others were rejected.

I think the root of the problem is that some servers at createsend are misconfigured.

From what I can tell by now, these servers use TLS encrypted connections with strong ciphers:

  • mx65.b.outbound.createsend.com
  • mx200.a.outbound.createsend.com
  • mx201.a.outbound.createsend.com
  • mx202.a.outbound.createsend.com

These servers either use no transport encryption or TLS encryption with weak ciphers:

  • mx147.g.outbound.createsend.com
  • mx35.b.outbound.createsend.com

It would be really nice if this could be fixed.

Thanks and kind regards.

commented

Appreciate you raising the issue!

We're not in control of these servers, Campaign Monitor is. That being said, I've been considering a switch off CM for our email delivery for some time and this is one more nudge in that direction. Two questions for you:

  1. Do you know if Postmark's SMTP servers suffer from this or similar misconfigurations?
  2. Do you have a tool/command that I can use to test for this repeatedly?