Deliverability to comcast.net

Emails Sent to comcast.net: 5,579,952

Open Rate to comcast.net: 801,628 (14.4%)

Date range:
Display as:

Sent vs Opens for comcast.net

Date Sent Opens Open Rate
12/10/2019 11,489 1,174 0.0%
12/9/2019 9,813 1,742 0.0%
12/8/2019 4,178 602 0.0%
12/7/2019 5,668 825 0.0%
12/6/2019 11,218 1,658 0.0%
12/5/2019 13,611 1,636 0.0%
12/4/2019 13,238 2,094 0.0%
12/3/2019 14,631 2,022 0.0%
12/2/2019 17,735 2,654 0.0%
12/1/2019 4,980 914 0.0%
11/30/2019 10,532 1,146 0.0%
11/29/2019 6,419 1,033 0.0%
11/28/2019 6,191 871 0.0%
11/27/2019 10,645 1,560 0.0%
11/26/2019 13,799 2,076 0.0%
11/25/2019 12,757 1,922 0.0%
11/24/2019 4,035 697 0.0%
11/23/2019 5,206 834 0.0%
11/22/2019 11,448 1,907 0.0%
11/21/2019 11,389 1,758 0.0%
11/20/2019 13,575 2,276 0.0%
11/19/2019 14,172 2,093 0.0%
11/18/2019 13,158 1,930 0.0%
11/17/2019 4,408 654 0.0%
11/16/2019 8,427 1,265 0.0%
11/15/2019 11,871 1,859 0.0%
11/14/2019 13,538 1,904 0.0%
11/13/2019 12,921 1,751 0.0%
11/12/2019 11,509 1,888 0.0%
11/11/2019 12,410 1,750 0.0%

Blocks from comcast.net

No blocks during specified time frame

Bounces from comcast.net

Message Count
550 5.1.1 Not our Customer 3,147
550 5.1.1 recipient not available 87
550 5.1.1 recipient mailbox unallocated 41
552 5.1.1 recipient rejected - extended quota violation 26
554 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 14
554 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 13
X-Postfix; delivery temporarily suspended: connect to mx2.comcast.net: Network is unreachable 9
X-Postfix; delivery temporarily suspended: connect to mx1.comcast.net: Network is unreachable 8
452 4.1.1 user over quota 8
550 5.1.1 Account not available 5
550 relay not permitted 4
550 5.1.10 Recipient not found by SMTP address lookup 3
X-Postfix; connect to mx1.comcast.net: Network is unreachable 3
554 resimta-po-18v.sys.comcast.net resimta-po-18v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 2
X-Postfix; delivery temporarily suspended: host mx2.comcast.net refused to talk to me: 554 138.68.234.190 Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: http://postmaster.comcast.net/smtp-error-codes.php#554 2
535-5.7.8 Username and Password not accepted. 2
X-Postfix; delivery temporarily suspended: lost connection with mx1.comcast.net while receiving the initial server greeting 2
554 resimta-po-11v.sys.comcast.net resimta-po-11v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 2
X-Postfix; delivery temporarily suspended: conversation with mx1.comcast.net timed out while sending MAIL FROM 2
554 138.68.234.190 Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: http://postmaster.comcast.net/smtp-error-codes.php#554 2
X-Postfix; connect to mx2.comcast.net: Network is unreachable 2
X-Postfix; delivery temporarily suspended: host mx1.comcast.net refused to talk to me: 554 resimta-po-37v.sys.comcast.net resimta-po-37v.sys.comcast.net ESMTP server not available 2
550 5.4.5 Daily user sending quota exceeded. - gsmtp 2
X-Postfix; delivery temporarily suspended: host mx1.comcast.net refused to talk to me: 554 resimta-po-09v.sys.comcast.net resimta-po-09v.sys.comcast.net 138.68.234.190 Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: http://postmaster.comcast.net/smtp-error-codes.php#554 1
X-Postfix; delivery temporarily suspended: lost connection with mx2.comcast.net while receiving the initial server greeting 1
554 resimta-po-20v.sys.comcast.net resimta-po-20v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-01v.sys.comcast.net resimta-po-01v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-19v.sys.comcast.net resimta-po-19v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
421 resimta-po-09v.sys.comcast.net resimta-po-09v.sys.comcast.net Too many sessions opened 1
554 resimta-po-21v.sys.comcast.net resimta-po-21v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
550-5.7.1 The user or domain that you are sending to has a policy that 550-5.7.1 prohibited the mail that you sent. Please contact your domain 550-5.7.1 administrator for further details. For more information, please visit 550 5.7.1 https://support.google.com/a/answer/172179 1
X-Postfix; delivery temporarily suspended: host mx1.comcast.net refused to talk to me: 554 resimta-po-40v.sys.comcast.net resimta-po-40v.sys.comcast.net 138.68.234.190 Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: http://postmaster.comcast.net/smtp-error-codes.php#554 1
554 5.1.0 167.89.12.138 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 resimta-po-14v.sys.comcast.net resimta-po-14v.sys.comcast.net 66.45.226.253 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-10v.sys.comcast.net resimta-po-10v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-14v.sys.comcast.net resimta-po-14v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-13v.sys.comcast.net resimta-po-13v.sys.comcast.net 138.68.234.190 Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: http://postmaster.comcast.net/smtp-error-codes.php#554 1
552 5.2.2 Quota exceeded 1
554 resimta-po-17v.sys.comcast.net resimta-po-17v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
The recipient server did not accept our requests to connect. 1
554 resimta-po-15v.sys.comcast.net resimta-po-15v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-26v.sys.comcast.net resimta-po-26v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-27v.sys.comcast.net resimta-po-27v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 5.7.1 Mailbox has reached daily sending limits for this IP: 209.85.222.46 1
554 resimta-po-18v.sys.comcast.net resimta-po-18v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-07v.sys.comcast.net resimta-po-07v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-33v.sys.comcast.net resimta-po-33v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-06v.sys.comcast.net resimta-po-06v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-27v.sys.comcast.net resimta-po-27v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-07v.sys.comcast.net resimta-po-07v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-16v.sys.comcast.net resimta-po-16v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-24v.sys.comcast.net resimta-po-24v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-32v.sys.comcast.net resimta-po-32v.sys.comcast.net 66.45.226.253 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-29v.sys.comcast.net resimta-po-29v.sys.comcast.net 168.245.114.95 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-03v.sys.comcast.net resimta-po-03v.sys.comcast.net 149.72.197.126 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
535 5.7.8 Error: authentication failed: 1
550-5.7.1 Your email has been rejected, students are only allowed to send and 550 5.7.1 receive emails from the @peachschools.org domain. - gcdp - gsmtp 1
550-5.7.1 Our system has detected that this message is 550-5.7.1 likely suspicious due to the very low reputation of the sending 550-5.7.1 domain. To best protect our users from spam, the message has been 550-5.7.1 blocked. Please visit 550 5.7.1 https://support.google.com/mail/answer/188131 1
554 66.45.226.253 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-08v.sys.comcast.net resimta-po-08v.sys.comcast.net 138.68.234.190 Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: http://postmaster.comcast.net/smtp-error-codes.php#554 1

Methodology

Send and open statistics are updated daily. Bounces and blocks are updated in real-time. Every day, open statistics are updated for the last 14 days. Generally, you'll notice an increase of an open rate for a domain for a day over the course of 14 days, since not all open events occur the same day an email is sent. That means that open rate data is tied to the actual emails sent on a particular day.

Bounce and block codes are the codes as returned by the remote SMTP server after having been de-personalized. Meaning, unique identifiers present in SMTP codes are removed so that SMTP responses can be grouped for analysis. In certain cases, such as when the email is being relayed through an intermediary SMTP server, the remote SMTP server may not be the same as the MX record for the domain. SMTP codes are categorized as "bounces" vs "blocks" by internal human review. Bounces generally indicate an invalid email address. Blocks generally indicate a rejection of the email message but a valid email address.