Deliverability to comcast.net

Emails Sent to comcast.net: 7,928,896

Open Rate to comcast.net: 1,132,448 (14.3%)

Date range:
Display as:

Sent vs Opens for comcast.net

Date Sent Opens Open Rate
6/5/2020 12,947 1,392 0.0%
6/4/2020 13,059 2,228 0.0%
6/3/2020 14,802 2,143 0.0%
6/2/2020 14,835 2,297 0.0%
6/1/2020 14,716 2,821 0.0%
5/31/2020 8,753 1,330 0.0%
5/30/2020 8,442 1,173 0.0%
5/29/2020 14,649 1,931 0.0%
5/28/2020 13,044 2,169 0.0%
5/27/2020 14,594 2,572 0.0%
5/26/2020 17,096 2,547 0.0%
5/25/2020 9,137 1,496 0.0%
5/24/2020 7,015 1,159 0.0%
5/23/2020 8,326 1,387 0.0%
5/22/2020 18,258 2,663 0.0%
5/21/2020 18,436 2,415 0.0%
5/20/2020 14,275 2,307 0.0%
5/19/2020 20,194 2,635 0.0%
5/18/2020 17,568 2,503 0.0%
5/17/2020 11,027 1,498 0.0%
5/16/2020 12,735 1,834 0.0%
5/15/2020 19,276 2,830 0.0%
5/14/2020 16,864 2,859 0.0%
5/13/2020 16,981 2,292 0.0%
5/12/2020 22,361 4,317 0.0%
5/11/2020 13,840 2,448 0.0%
5/10/2020 8,162 1,024 0.0%
5/9/2020 11,048 1,586 0.0%
5/8/2020 19,059 2,542 0.0%
5/7/2020 16,343 2,858 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 3,814
550 4.2.0 Not our Customer 167
554 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 114
550 5.2.0 - Recipient unavailable 93
550 5.1.1 recipient mailbox unallocated 64
Message queue continuously deferred for too long. See https://sendgrid.com/docs/glossary/throttling/#what-causes-a-deferral 59
450 4.2.0 - Recipient temporarily unavailable 45
554 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 42
552 5.1.1 recipient rejected - extended quota violation 40
452 4.1.1 too many recent messages; Try again later 30
550 5.2.0 Not our Customer 11
452 4.1.1 user over quota 10
SMTP; 550 5.1.1 Not our Customer 9
554 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 8
554 resimta-po-31v.sys.comcast.net resimta-po-31v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 7
550 5.1.8 Access denied, bad outbound sender AS 6
554 resimta-po-16v.sys.comcast.net resimta-po-16v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 6
554 resimta-po-23v.sys.comcast.net resimta-po-23v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 5
554 resimta-po-05v.sys.comcast.net resimta-po-05v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 4
554 resimta-po-20v.sys.comcast.net resimta-po-20v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 4
554 resimta-po-20v.sys.comcast.net resimta-po-20v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 4
554 resimta-po-29v.sys.comcast.net resimta-po-29v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 4
554 resimta-po-39v.sys.comcast.net resimta-po-39v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 4
554 5.1.0 167.89.17.173 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 4
554 resimta-po-15v.sys.comcast.net resimta-po-15v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 4
554 168.245.123.183 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 4
554 resimta-po-04v.sys.comcast.net resimta-po-04v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 4
554 resimta-po-09v.sys.comcast.net resimta-po-09v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 4
554 resimta-po-13v.sys.comcast.net resimta-po-13v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-18v.sys.comcast.net resimta-po-18v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-14v.sys.comcast.net resimta-po-14v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-24v.sys.comcast.net resimta-po-24v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-35v.sys.comcast.net resimta-po-35v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-30v.sys.comcast.net resimta-po-30v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-12v.sys.comcast.net resimta-po-12v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-40v.sys.comcast.net resimta-po-40v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-34v.sys.comcast.net resimta-po-34v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
550 5.1.10 Recipient not found by SMTP address lookup 3
554 resimta-po-27v.sys.comcast.net resimta-po-27v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-10v.sys.comcast.net resimta-po-10v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-17v.sys.comcast.net resimta-po-17v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-25v.sys.comcast.net resimta-po-25v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-38v.sys.comcast.net resimta-po-38v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 3
554 resimta-po-06v.sys.comcast.net resimta-po-06v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 3
554 resimta-po-33v.sys.comcast.net resimta-po-33v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 2
554 resimta-po-03v.sys.comcast.net resimta-po-03v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 2
554 resimta-po-07v.sys.comcast.net resimta-po-07v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 2
554 resimta-po-03v.sys.comcast.net resimta-po-03v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 2
554 resimta-po-11v.sys.comcast.net resimta-po-11v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 2
550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. 2
554 resimta-po-32v.sys.comcast.net resimta-po-32v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 2
452 4.1.1 requested action aborted: try again later 2
554 resimta-po-24v.sys.comcast.net resimta-po-24v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 2
554 resimta-po-34v.sys.comcast.net resimta-po-34v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 2
552 :: auth :: Message rejected for spam or virus content :: 2
554 resimta-po-32v.sys.comcast.net resimta-po-32v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 2
554 resimta-po-36v.sys.comcast.net resimta-po-36v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 2
554 resimta-po-01v.sys.comcast.net resimta-po-01v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 2
554 resimta-po-22v.sys.comcast.net resimta-po-22v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 2
554 resimta-po-28v.sys.comcast.net resimta-po-28v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 2
452 4.1.1 mailbox unallocated 2
554 resimta-po-29v.sys.comcast.net resimta-po-29v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 2
554 resimta-po-19v.sys.comcast.net resimta-po-19v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 2
554 resimta-po-31v.sys.comcast.net resimta-po-31v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-11v.sys.comcast.net resimta-po-11v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 1
550 " is in an RBL on bl.websitewelcome.com, see " 1
554 resimta-po-37v.sys.comcast.net resimta-po-37v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-39v.sys.comcast.net resimta-po-39v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-26v.sys.comcast.net resimta-po-26v.sys.comcast.net 168.245.123.183 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-40v.sys.comcast.net resimta-po-40v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-26v.sys.comcast.net resimta-po-26v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-21v.sys.comcast.net resimta-po-21v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 1
554 resimta-po-23v.sys.comcast.net resimta-po-23v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
552 5.2.0 - g6nuj4xm4??Virus infected message rejected. IB705 1
550 Invalid recipient: 1
554 resimta-po-19v.sys.comcast.net resimta-po-19v.sys.comcast.net 50.31.60.236 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
554 resimta-po-37v.sys.comcast.net resimta-po-37v.sys.comcast.net 168.245.123.183 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-04v.sys.comcast.net resimta-po-04v.sys.comcast.net 167.89.24.164 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 1
554 50.31.63.190 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
421 4.1.0 192.185.26.22 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 1
554 resimta-po-03v.sys.comcast.net resimta-po-03v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-30v.sys.comcast.net resimta-po-30v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-09v.sys.comcast.net resimta-po-09v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-39v.sys.comcast.net resimta-po-39v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-02v.sys.comcast.net resimta-po-02v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 1
554 resimta-po-23v.sys.comcast.net resimta-po-23v.sys.comcast.net 50.31.60.236 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
554 5.1.0 167.89.10.181 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 resimta-po-35v.sys.comcast.net resimta-po-35v.sys.comcast.net 50.31.63.190 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
550 4.2.0 recipient mailbox unallocated 1
554 resimta-po-02v.sys.comcast.net resimta-po-02v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
550 5.4.1 All recipient addresses rejected : Access denied. AS 1
554 resimta-po-05v.sys.comcast.net resimta-po-05v.sys.comcast.net 168.245.123.183 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-25v.sys.comcast.net resimta-po-25v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-22v.sys.comcast.net resimta-po-22v.sys.comcast.net 168.245.123.183 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 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-21v.sys.comcast.net resimta-po-21v.sys.comcast.net 50.31.60.236 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
554 resimta-po-04v.sys.comcast.net resimta-po-04v.sys.comcast.net 149.72.222.136 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-25v.sys.comcast.net resimta-po-25v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-37v.sys.comcast.net resimta-po-37v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 1
554 resimta-po-08v.sys.comcast.net resimta-po-08v.sys.comcast.net 91.221.37.85 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 91.221.37.85 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 168.245.123.183 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-22v.sys.comcast.net resimta-po-22v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 1
554 resimta-po-07v.sys.comcast.net resimta-po-07v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-40v.sys.comcast.net resimta-po-40v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
X-Unix; 73 1
554 resimta-po-21v.sys.comcast.net resimta-po-21v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-06v.sys.comcast.net resimta-po-06v.sys.comcast.net 50.31.60.236 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
554 resimta-po-17v.sys.comcast.net resimta-po-17v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-38v.sys.comcast.net resimta-po-38v.sys.comcast.net 168.245.123.183 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-17v.sys.comcast.net resimta-po-17v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-02v.sys.comcast.net resimta-po-02v.sys.comcast.net 91.221.37.85 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 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 1
554 resimta-po-15v.sys.comcast.net resimta-po-15v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-31v.sys.comcast.net resimta-po-31v.sys.comcast.net 50.31.60.236 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
554 50.31.60.236 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
554 resimta-po-10v.sys.comcast.net resimta-po-10v.sys.comcast.net 91.221.37.85 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 50.31.60.236 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
554 resimta-po-16v.sys.comcast.net resimta-po-16v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
554 resimta-po-06v.sys.comcast.net resimta-po-06v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000011 1
421 resimta-po-26v.sys.comcast.net resimta-po-26v.sys.comcast.net Too many sessions opened 1
554 resimta-po-40v.sys.comcast.net resimta-po-40v.sys.comcast.net 50.31.60.236 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000001 1
554 resimta-po-24v.sys.comcast.net resimta-po-24v.sys.comcast.net 149.72.222.136 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-28v.sys.comcast.net resimta-po-28v.sys.comcast.net 91.221.37.85 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 1
554 resimta-po-38v.sys.comcast.net resimta-po-38v.sys.comcast.net 149.72.151.46 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL001000 1
554 resimta-po-11v.sys.comcast.net resimta-po-11v.sys.comcast.net 168.245.123.183 found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-error-codes.php#BL000010 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.