This is a cryptographically signed message in MIME format. --------------ms050204090703000502050305 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Hello, it looks like mailserver which serving users(a)ovirt.org is on blacklist. line from our smtp server log... Oct 17 15:31:25 hermes postfix/smtpd[14082]: NOQUEUE: reject: RCPT from=20 lists.ovirt.org[2600:3c01::f03c:91ff:fe93:4b0d]: 554 5.7.1 Service=20 unavailable; Client host [2600:3c01::f03c:91ff:fe93:4b0d] blocked using=20 sbl.spamhaus.org; https://www.spamhaus.org/sbl/query/SBLCSS;=20 from=3D&lt;users-bounces(a)ovirt.org&gt; to=3D&lt;jiri.slezka(a)slu.cz&gt; proto=3DESMTP = helo=3D<lists.ovirt.org> Cheers, Jiri --------------ms050204090703000502050305 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC CWcwggScMIIDhKADAgECAhEAuOSLPwlcx/l5IqBlguM0fDANBgkqhkiG9w0BAQUFADA7MQsw CQYDVQQGEwJOTDEPMA0GA1UEChMGVEVSRU5BMRswGQYDVQQDExJURVJFTkEgUGVyc29uYWwg Q0EwHhcNMTQxMTEwMDAwMDAwWhcNMTYxMTA5MjM1OTU5WjBlMQswCQYDVQQGEwJDWjElMCMG 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