Spoof + attempted relay.
EHLO 2Rz5qOfUN
FROM: <sales@target-domain>
TO: <jacksb ... show moreSpoof + attempted relay.
EHLO 2Rz5qOfUN
FROM: <sales@target-domain>
TO: <[email protected]> show less
Email SpamHackingSpoofingBrute-Force
Anonymous
Aug 10 15:20:49 parsel postfix/smtpd[299360]: NOQUEUE: reject: RCPT from unknown[155.254.25.39]: 554 ... show moreAug 10 15:20:49 parsel postfix/smtpd[299360]: NOQUEUE: reject: RCPT from unknown[155.254.25.39]: 554 5.7.1 <[email protected]>: Relay access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<avEznISSV>
Aug 10 15:20:55 parsel postfix/smtpd[298664]: warning: unknown[155.254.25.39]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
... show less
LF_SMTPAUTH: (smtpauth) Failed SMTP AUTH login from 155.254.25.39 (US/United States/-): 2 in the las ... show moreLF_SMTPAUTH: (smtpauth) Failed SMTP AUTH login from 155.254.25.39 (US/United States/-): 2 in the last 3600 secs show less