$ openssl s_client -crlf -ssl3 -connect imap.strato.de:993 CONNECTED(00000003) depth=1 C = DE, O = T-Systems International GmbH, OU = T-Systems Trust Center, ST = Nordrhein Westfalen, postalCode = 57250, L = Netphen, street = Untere Industriestr. 20, CN = TeleSec ServerPass DE-2 verify error:num=20:unable to get local issuer certificate verify return:0 --- Certificate chain 0 s:/C=DE/O=Strato AG/OU=Rechenzentrum/ST=Berlin/L=Berlin/CN=imap.strato.de i:/C=DE/O=T-Systems International GmbH/OU=T-Systems Trust Center/ST=Nordrhein Westfalen/postalCode=57250/L=Netphen/street=Untere Industriestr. 20/CN=TeleSec ServerPass DE-2 1 s:/C=DE/O=T-Systems International GmbH/OU=T-Systems Trust Center/ST=Nordrhein Westfalen/postalCode=57250/L=Netphen/street=Untere Industriestr. 20/CN=TeleSec ServerPass DE-2 i:/C=DE/O=Deutsche Telekom AG/OU=T-TeleSec Trust Center/CN=Deutsche Telekom Root CA 2 --- Server certificate -----BEGIN CERTIFICATE----- MIIHPDCCBiSgAwIBAgIIfMzoig9rhZcwDQYJKoZIhvcNAQELBQAwgdkxCzAJBgNV BAYTAkRFMSUwIwYDVQQKExxULVN5c3RlbXMgSW50ZXJuYXRpb25hbCBHbWJIMR8w HQYDVQQLExZULVN5c3RlbXMgVHJ1c3QgQ2VudGVyMRwwGgYDVQQIExNOb3Jkcmhl aW4gV2VzdGZhbGVuMQ4wDAYDVQQREwU1NzI1MDEQMA4GA1UEBxMHTmV0cGhlbjEg MB4GA1UECRMXVW50ZXJlIEluZHVzdHJpZXN0ci4gMjAxIDAeBgNVBAMTF1RlbGVT ZWMgU2VydmVyUGFzcyBERS0yMB4XDTE0MDQxNjE2MjAzOFoXDTE1MDQyMTIzNTk1 OVowdDELMAkGA1UEBhMCREUxEjAQBgNVBAoTCVN0cmF0byBBRzEWMBQGA1UECxMN UmVjaGVuemVudHJ1bTEPMA0GA1UECBMGQmVybGluMQ8wDQYDVQQHEwZCZXJsaW4x FzAVBgNVBAMTDmltYXAuc3RyYXRvLmRlMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A MIIBCgKCAQEAp23BGI8C1FXiQXhawGnzWC5IaLF9Lyabo5gx72hrRHYpxbspivWP CGRYWNfHJp4w1itYRmQGZ1QSIgOxtnSo16yRGzL+ZgR76ARgWE6s+LLSbVzP/osq 6zK0zU6RXjxz0Sdcgs9kA86VmQK5pDWzBHhDzJU/XVVUc+ksQECnSl/fpyhCAx3I 8tNAzajt3OlHgEolghhg33l6z7nQ7wskQpStBhlHRr+FHghPlNr87btLMavER7lG 0VDyqlrwU8sV7wMDxUr++L9YlcL1TdOIteOxObY+/vhKEBXqGhMq907QDKXn0yDQ HBtHW//ePXUepGJl1HWUpxNUv5j5OGUVkQIDAQABo4IDajCCA2YwHwYDVR0jBBgw FoAUVAQpb6KTxpAxRcA93iviCmmAkl8wDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQW MBQGCCsGAQUFBwMCBggrBgEFBQcDATAdBgNVHQ4EFgQUH7hlHP2rtfgq4r4srdmo JHJ3Ea4wWQYDVR0gBFIwUDBEBgkrBgEEAb1HDQIwNzA1BggrBgEFBQcCARYpaHR0 cDovL3d3dy50ZWxlc2VjLmRlL3NlcnZlcnBhc3MvY3BzLmh0bWwwCAYGZ4EMAQIC MIIBIQYDVR0fBIIBGDCCARQwRaBDoEGGP2h0dHA6Ly9jcmwuc2VydmVycGFzcy50 ZWxlc2VjLmRlL3JsL1RlbGVTZWNfU2VydmVyUGFzc19ERS0yLmNybDCByqCBx6CB xIaBwWxkYXA6Ly9sZGFwLnNlcnZlcnBhc3MudGVsZXNlYy5kZS9jbj1UZWxlU2Vj JTIwU2VydmVyUGFzcyUyMERFLTIsb3U9VC1TeXN0ZW1zJTIwVHJ1c3QlMjBDZW50 ZXIsbz1ULVN5c3RlbXMlMjBJbnRlcm5hdGlvbmFsJTIwR21iSCxjPWRlP2NlcnRp ZmljYXRlUmV2b2NhdGlvbmxpc3Q/YmFzZT9jZXJ0aWZpY2F0ZVJldm9jYXRpb25s aXN0PSowggE5BggrBgEFBQcBAQSCASswggEnMDMGCCsGAQUFBzABhidodHRwOi8v b2NzcC5zZXJ2ZXJwYXNzLnRlbGVzZWMuZGUvb2NzcHIwTAYIKwYBBQUHMAKGQGh0 dHA6Ly9jcmwuc2VydmVycGFzcy50ZWxlc2VjLmRlL2NydC9UZWxlU2VjX1NlcnZl clBhc3NfREUtMi5jZXIwgaEGCCsGAQUFBzAChoGUbGRhcDovL2xkYXAuc2VydmVy cGFzcy50ZWxlc2VjLmRlL2NuPVRlbGVTZWMlMjBTZXJ2ZXJQYXNzJTIwREUtMixv dT1ULVN5c3RlbXMlMjBUcnVzdCUyMENlbnRlcixvPVQtU3lzdGVtcyUyMEludGVy bmF0aW9uYWwlMjBHbWJILGM9ZGU/Y0FDZXJ0aWZpY2F0ZTAMBgNVHRMBAf8EAjAA MCoGA1UdEQQjMCGCDmltYXAuc3RyYXRvLmRlgg9pbWFwLnN0cmF0by5jb20wDQYJ KoZIhvcNAQELBQADggEBAKCSN8uaIaXfOzz/TMatMSdNxV4HFYMEFTYYB3L9E+4F 7iwwvMtjXFqPqOdBmgf+T50gC9mtvRFysCPNLn/41J7aI78D71pWTOMxqnm95Pf+ mMJdjUc04TzdI22QCNIhxHvXh3pmjoSgilzR4FBFZzxTbY0r8KghjDF/gy7yluz/ 6v+1rLYYJgHYifTyx8SAFulIKglYITxaZxzt5GEOX4AKAOgnjQRTZxqech9v2gzz t9kUBuqi72EgMDpOZGDBJ1BVh6ficfW/ycS+DRkyZqD6mrJm2P8oZ6v16oFoG8rG EDBXjloUUsBRoWX8maaODzbhtNTslI4XBnhYxggqogY= -----END CERTIFICATE----- subject=/C=DE/O=Strato AG/OU=Rechenzentrum/ST=Berlin/L=Berlin/CN=imap.strato.de issuer=/C=DE/O=T-Systems International GmbH/OU=T-Systems Trust Center/ST=Nordrhein Westfalen/postalCode=57250/L=Netphen/street=Untere Industriestr. 20/CN=TeleSec ServerPass DE-2 --- No client certificate CA names sent --- SSL handshake has read 4254 bytes and written 352 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 : SSLv3 Cipher : DHE-RSA-AES256-SHA Session-ID: Session-ID-ctx: Master-Key: 75B056372ECECB3CFF8FD031037567E7733BDD33C43A615707FACA2BCAB70D0C046992E9A49DAC5DCEDFC92982760CD2 Key-Arg : None PSK identity: None PSK identity hint: None SRP username: None Start Time: 1413453232 Timeout : 7200 (sec) Verify return code: 20 (unable to get local issuer certificate) --- * OK [CAPABILITY IMAP4 IMAP4rev1 AUTH=SCRAM-SHA-1 AUTH=DIGEST-MD5 AUTH=CRAM-MD5 AUTH=LOGIN AUTH=PLAIN CHILDREN I18NLEVEL=2 ID IDLE MOVE MULTIAPPEND NAMESPACE QUOTA SORT UIDPLUS UNSELECT WITHIN XLIST] IMAP server ready (P18 DHE-RSA-AES256-SHA)