Sendgrid Blacklisted

SendGrid Blacklisted for aiding spammers sending unsolicited unconfirmed bulk email

Reason: SendGrid  Blacklisted (sendgrid.net/sendgrid.com) for aiding spammers with sending spam to unconfirmed / non optin HARVESTED mail addresses and or Spam Traps – more than 3 strikes within a month

Evidence:

• Refusal to remove bouncing email addresses of their spam lists. This is a technical issue caused by really bad list and bounce management of the ESP.
• Aug 15 20:52:54 vps110291 postfix/smtpd[22934]: NOQUEUE: reject: RCPT from o1678986x109.outbound-mail.sendgrid.net[167.89.86.109]: 554 5.7.1 <[email protected]>: Sender address rejected: Blacklisted UBE https://abuse.privacy4all.org; from=<[email protected]> to=<XXXXXXXXXXXXXXXXXXX> proto=ESMTP helo=<o1678986x109.outbound-mail.sendgrid.net>
• Aug 18 00:41:48 vps110291 postfix/smtpd[3324]: NOQUEUE: reject: RCPT from o1678986x109.outbound-mail.sendgrid.net[167.89.86.109]: 554 5.7.1 <[email protected]>: Sender address rejected: Blacklisted UBE https://abuse.privacy4all.org; from=<[email protected]> to=<XXXXXXXXXXXXXXXXXXX> proto=ESMTP helo=<o1678986x109.outbound-mail.sendgrid.net>
• Aug 15 20:52:54 vps110291 postfix/smtpd[22934]: NOQUEUE: reject: RCPT from o1678986x109.outbound-mail.sendgrid.net[167.89.86.109]: 554 5.7.1 <[email protected]>: Sender address rejected: Blacklisted UBE https://abuse.privacy4all.org; from=<[email protected]> to= proto=ESMTP helo=<o1678986x109.outbound-mail.sendgrid.net>
• Aug 1 15:01:32 behemoth postfix/smtpd[24776]: Anonymous TLS connection established from o3.7nf.shared.sendgrid.net[167.89.100.251]: TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)
  Aug 1 15:01:33 behemoth postfix/smtpd[24776]: NOQUEUE: reject: RCPT from o3.7nf.shared.sendgrid.net[167.89.100.251]: 554 5.7.1 Service unavailable; Client host [167.89.100.251] blocked using bl.spamcop.net; Blocked – see http://www.spamcop.net/bl.shtml?167.89.100.251; from=<[email protected]> to=<XXXXXXXXXXXXXXXXXXX> proto=ESMTP helo=<o3.7nf.shared.sendgrid.net>
• Aug 1 15:01:33 behemoth postfix/smtpd[24779]: Anonymous TLS connection established from o3.7nf.shared.sendgrid.net[167.89.100.251]: TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)
  Aug 1 15:01:34 behemoth postfix/smtpd[24779]: NOQUEUE: reject: RCPT from o3.7nf.shared.sendgrid.net[167.89.100.251]: 554 5.7.1 Service unavailable; Client host [167.89.100.251] blocked using bl.spamcop.net; Blocked – see http://www.spamcop.net/bl.shtml?167.89.100.251; from=<[email protected]> to=<XXXXXXXXXXXXXXXXXXX> proto=ESMTP helo=<o3.7nf.shared.sendgrid.net>
• Aug 1 15:02:08 behemoth postfix/smtpd[24776]: Anonymous TLS connection established from o3.7nf.shared.sendgrid.net[167.89.100.251]: TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)
  Aug 1 15:02:09 behemoth postfix/smtpd[24776]: NOQUEUE: reject: RCPT from o3.7nf.shared.sendgrid.net[167.89.100.251]: 554 5.7.1 Service unavailable; Client host [167.89.100.251] blocked using bl.spamcop.net; Blocked – see http://www.spamcop.net/bl.shtml?167.89.100.251; from=<[email protected]> to=<XXXXXXXXXXXXXXXXXXX> proto=ESMTP helo=<o3.7nf.shared.sendgrid.net>

Actions taken:

• Spammer domain blacklisted
• ESP spam network Sendgrid.net/sendgrid.com blacklisted and blocked

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