Error in certificate: Peer's certificate issuer has been marked as not trusted by the.

mailx-ssl-error-sending-email.sh

Operating System: CentOS 7

These are the steps to follow when sending email from command line using SSL, for example:

echo "" | /bin/mail -v -q -s "subject" -r from@company.com -S smtp-auth=login -S smtp=smtps://secure.emailsrvr.com:465 -S smtp-auth-user="from@company.com" -S smtp-auth-password="SECRET" to@company.com

Steps:

1. Fix the Missing "nss-config-dir" variable error
2. Pull the certificate chain using openss s_client -showcerts command
3. Extract the certificate that signed the secure.emailsrvr.com
4. Install into the Centos NSSDB database

1. Fix the Missing "nss-config-dir" variable error

Edit /etc/mail.rc and append this line at the end: set nss-config-dir=/etc/pki/nssdb

2. Pull the certificate chain using openss s_client -showcerts command

$> openssl s_client -showcerts -connect secure.emailsrvr.com:465
CONNECTED(00000003)
depth=3 /C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
verify return:1
depth=2 /C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority
verify return:1
depth=1 /C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
verify return:1
depth=0 /OU=Domain Control Validated/OU=EssentialSSL/CN=secure.emailsrvr.com
verify return:1
---
Certificate chain
 0 s:/OU=Domain Control Validated/OU=EssentialSSL/CN=secure.emailsrvr.com
   i:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
 1 s:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
   i:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority
-----BEGIN CERTIFICATE-----
MIIGCDCCA/CgAwIBAgIQKy5u6tl1NmwUim7bo3yMBzANBgkqhkiG9w0BAQwFADCB
hTELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
A1UEBxMHU2FsZm9yZDEaMBgGA1UEChMRQ09NT0RPIENBIExpbWl0ZWQxKzApBgNV
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0fxQ8ANAe4hZ7Q7drNJ3gjTcBpUC2JD5Leo31Rpg0Gcg19hCC0Wvgmje3WYkN5Ap
lBlGGSW4gNfL1IYoakRwJiNiqZ+Gb7+6kHDSVneFeO/qJakXzlByjAA6quPbYzSf
+AZxAeKCINT+b72x
-----END CERTIFICATE-----
 2 s:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority
   i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
-----BEGIN CERTIFICATE-----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m1y9TBsoilwie7SrmNnu4FGDwwlGTm0+mfqVF9p8M1dBPI1R7Qu2XK8sYxrfV8g/
vOldxJuvRZnio1oktLqpVj3Pb6r/SVi+8Kj/9Lit6Tf7urj0Czr56ENCHonYhMsT
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JMtUGjAdBgNVHQ4EFgQUu69+Aj36pvE8hI6t7jiY7NkyMtQwDgYDVR0PAQH/BAQD
AgGGMA8GA1UdEwEB/wQFMAMBAf8wEQYDVR0gBAowCDAGBgRVHSAAMEQGA1UdHwQ9
MDswOaA3oDWGM2h0dHA6Ly9jcmwudXNlcnRydXN0LmNvbS9BZGRUcnVzdEV4dGVy
bmFsQ0FSb290LmNybDA1BggrBgEFBQcBAQQpMCcwJQYIKwYBBQUHMAGGGWh0dHA6
Ly9vY3NwLnVzZXJ0cnVzdC5jb20wDQYJKoZIhvcNAQEMBQADggEBAGS/g/FfmoXQ
zbihKVcN6Fr30ek+8nYEbvFScLsePP9NDXRqzIGCJdPDoCpdTPW6i6FtxFQJdcfj
Jw5dhHk3QBN39bSsHNA7qxcS1u80GH4r6XnTq1dFDK8o+tDb5VCViLvfhVdpfZLY
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B5a6SE2Q8pTIqXOi6wZ7I53eovNNVZ96YUWYGGjHXkBrI/V5eu+MtWuLt29G9Hvx
PUsE2JOAWVrgQSQdso8VYFhH2+9uRv0V9dlfmrPb2LjkQLPNlzmuhbsdjrzch5vR
pu/xO28QOG8=
-----END CERTIFICATE-----
 3 s:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
   i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
-----BEGIN CERTIFICATE-----
MIIENjCCAx6gAwIBAgIBATANBgkqhkiG9w0BAQUFADBvMQswCQYDVQQGEwJTRTEU
MBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFs
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6wwCURQtjr0W4MHfRnXnJK3s9EK0hZNwEGe6nQY1ShjTK3rMUUKhemPR5ruhxSvC
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mnkPIAou1Z5jJh5VkpTYghdae9C8x49OhgQ=
-----END CERTIFICATE-----
---
Server certificate
subject=/OU=Domain Control Validated/OU=EssentialSSL/CN=secure.emailsrvr.com
issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
---
No client certificate CA names sent
---
SSL handshake has read 6119 bytes and written 328 bytes
---
New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1
    Cipher    : DHE-RSA-AES256-SHA
    Session-ID: 2C19AEB1002BB512457F5F528478C8D9EDE5152B3F8EF8AB83192CB6DFCAFA7F
    Session-ID-ctx: 
    Master-Key: 5CD40D0FB5F50237039551E18C4CB9183F12E7B66D69B3178FCEB7068C29EBD630C8DBEF57E51984FEA57536EF6571D3
    Key-Arg   : None
    Start Time: 1530575229
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)
---
220 smtp22.relay.ord1d.emailsrvr.com ESMTP - VA Code Section 18.2-152.3:1 forbids use of this system for unsolicited bulk electronic mail (Spam)
DONE

PRESS CTRL+C

3. Extract the certificate that signed the secure.emailsrvr.com

In our case this is the 2nd certificate (#1 -  1 s:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA)
Copy and paste it into a separate file, including BEGIN/END CERTIFICATE - i.e. comodo.pem 

4. Install into the Centos NSSDB database

$> certutil -A -t "C,," -n "Comodo RSA Domain Validation Secure Server CA" -d /etc/pki/nssdb/ -i comodo.pem

View the certificate:

#> certutil -L  -d /etc/pki/nssdb/

Certificate Nickname                                         Trust Attributes
                                                             SSL,S/MIME,JAR/XPI

Comodo RSA Domain Validation Secure Server CA                C,,