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You need to unblock this IP address please. Your email servers block way to many amazon AWS EC2 addresses automatically.
Sent: Tuesday, August 27, 2019 7:12 AM
To: Andrew Flagg
Subject: Message undeliverable: RE: some user's Hard Drive
Your message did not reach some or all of the intended recipients.
Sent: Tue, 27 Aug 2019 07:11:48 -0700
Subject: RE: some users Hard Drive
The following recipient(s) could not be reached:
some email address @sbcglobal.net
Error Type: SMTP
Remote server (126.96.36.199) issued an error.
sent: MAIL FROM:
Remote server replied: 553 5.3.0 flpd599 DNSBL:RBL 521< 188.8.131.52 >_is_blocked.For assistance forward this email to firstname.lastname@example.org
Sent: Tuesday, August 27, 2019 7:16 AM
To: andrew flagg
Subject: Re: FW: Message undeliverable: RE: some users Hard Drive [082719-101535-63339-00]
Thank you for contacting the AT&T Postmaster Staff.
We investigate every block report and removal request we receive and take the appropriate action, of which you will be notified. It is never the intention of the AT&T Postmaster staff to block legitimate mail. It is a rare but unfortunate occurrence that legitimate correspondence is blocked as a result of careful yet vigorous anti-spam and abuse countermeasures. We would like to rectify your mail delivery issue as soon as possible with your help. By emailing this address you have already taken the first step in resolving this issue.
When the AT&T Postmaster staff receives a request with the needed information requests are evaluated. If granted, the block will be removed within 24 to 48 hours. There are situations when mail interruptions or blocks are in place outside the AT&T domain. In these cases, we will attempt to make contact with the party initiating the block and seek a resolution. If there is no change after 48 hours please include the current and complete error message that you are receiving in your follow up email to <email@example.com>.
For more information about email best practices and mail delivery issues visit:
We reserve the right to deny or turn down a request if our research shows the requested IP(s) being a violator of SPAM or abuse policies currently, or in the past.
We at AT&T thank you for your assistance in reporting this matter and appreciate your patience while we investigate
AT&T Postmaster Staff
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