Hello!
Could it be that Courier MTA cannot be configured to send emails
securely (using SSL) to Sendgrid because they have their hostname in
SAN not in CN?
Thanks.
----- Forwarded message from "James (SendGrid Support)"
<supp...@sendgrid.zendesk.com> -----
Date: Thu, 16 Feb 2017 22:38:40 +0000
From: "James (SendGrid Support)" <supp...@sendgrid.zendesk.com>
## In replies all text above this line is added to the ticket ##
James, Feb 16, 15:38 MST
I brought this up to our securities team and they relayed this info to me:
Our certificate for smtp.sendgrid.net has a common name (CN) of:
```
Subject: OU=Domain Control Validated,
CN=*.smtp.sendgrid.net
```
however, we also have a Subject Alternative Name (SAN) of:
```
X509v3 Subject Alternative Name:
DNS:*.smtp.sendgrid.net, DNS:smtp.sendgrid.net
```
so our certificate is technically valid for smtp.sendgrid.net, but the
client has to check it according to [Subject Alternative
Name](https://en.wikipedia.org/wiki/Subject_Alternative_Name) rules.
As for the configuration change, I am not familiar with Courier MTA
and I am unsure as to why you're unable to send mail through SendGrid
with those settings. It may be best to try reaching out to their
support team for more assistance getting that set up (everything looks
correct from what I can tell checking out their documentation), or
have you already tried that?
I look forward to your reply!
James | Sr. Support Engineer</p>
--------------------------------
This email is a service from SendGrid.
----- End forwarded message -----
SZÉPE Viktor
https://github.com/szepeviktor/debian-server-tools/blob/master/CV.md
--
+36-20-4242498 s...@szepe.net skype: szepe.viktor
Budapest, III. kerület
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