Deliverability to comcast.net
Comcast is a multimedia giant with roots in music, film, television, and, you guessed it, email, and telecommunications. Comcast launched its online communications platform in 2008. Users can access their Comcast.net email and voice services via an integrated hub dubbed Xfinity Connect.

Emails Sent to comcast.net: 17,303,468

Open Rate to comcast.net: 2,266,295 (13.1%)

Date range:
Display as:

Sent vs Opens for comcast.net

Date Sent Opens Open Rate
10/18/2021 20,560 2,249 0.0%
10/17/2021 8,458 1,131 0.0%
10/16/2021 9,689 1,267 0.0%
10/15/2021 19,533 2,810 0.0%
10/14/2021 18,785 2,912 0.0%
10/13/2021 22,038 3,381 0.0%
10/12/2021 22,777 3,245 0.0%
10/11/2021 24,893 3,128 0.0%
10/10/2021 8,332 1,189 0.0%
10/9/2021 11,948 1,542 0.0%
10/7/2021 20,669 2,925 0.0%
10/6/2021 26,222 3,511 0.0%
10/5/2021 21,320 2,811 0.0%
10/4/2021 18,613 2,835 0.0%
10/3/2021 7,314 1,014 0.0%
10/2/2021 9,832 1,370 0.0%
10/1/2021 17,522 2,430 0.0%
9/30/2021 19,298 2,847 0.0%
9/29/2021 21,552 3,296 0.0%
9/28/2021 17,483 2,716 0.0%
9/27/2021 19,825 2,736 0.0%
9/26/2021 10,951 1,317 0.0%
9/25/2021 14,545 1,854 0.0%
9/24/2021 19,475 2,568 0.0%
9/23/2021 21,894 2,470 0.0%
9/22/2021 23,993 2,877 0.0%
9/21/2021 28,278 3,728 0.0%
9/20/2021 16,769 2,309 0.0%
9/19/2021 8,487 1,133 0.0%
9/18/2021 12,263 1,347 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 3,643
550 4.2.0 Not our Customer 1,632
550 Outgoing mail from "" has been suspended. 381
552 5.1.1 recipient rejected - extended quota violation 151
550 5.1.1 recipient unallocated 87
450 4.2.0 - Recipient temporarily unavailable 77
SMTP; 550 5.1.1 Not our Customer 42
550 5.2.0 - Recipient unavailable 41
550 4.2.0 recipient unallocated 37
550 5.2.0 Not our Customer 24
535 Incorrect authentication data 18
452 4.1.1 user over quota 14
550 5.1.10 Recipient not found by SMTP address lookup 9
452 4.2.0 user over quota 9
The recipient server did not accept our requests to connect. 9
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. 6
DNS Error. DNS type 'mx' lookup responded with code NXDOMAIN 5
550 5.1.0 invalid sender domain. 4
550 5.2.0 Message rejected due to DMARC. Please see http://postmaster.comcast.net/smtp-error-codes.php#DM000001 4
552 1 Requested mail action aborted, mailbox not found 3
550 5.1.8 Access denied, bad outbound sender AS 3
550 5.4.1 Recipient address rejected: Access denied. AS 3
550 5.1.0 Invalid sender domain 3
550 4.2.0 Invalid sender domain 2
554-5.4.6 Message exceeded 50 hops, this may indicate a mail loop. 2
421 4.1.0 Try again later 2
511 sorry, no mailbox here by that name 1
SMTP; 550 5.1.0 Invalid sender domain 1
452 4.2.0 ... temporary failure 1
550-5.2.1 The email account that you tried to reach is disabled. 1
550 4.2.0 invalid sender domain. 1
554 5.4.14 Hop count exceeded - possible mail loop ATTR34 1
452 5.2.0 ... temporary failure 1
421 error proxying data: recv: read tcp 149.72.119.238->96.114.157.80: read: connection timed out 1
550 5.4.1 All recipient addresses rejected : Access denied. AS 1
421 4.1.0 192.185.24.74 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 1
550 5.2.0 recipient unallocated 1
SMTP; 452 4.1.1 user over quota 1
550 5.1.1 not found 1
550 5.7.133 authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this group 1
SMTP; 552 5.1.1 recipient rejected - extended quota violation 1
5.1.0 - Unknown address error 550-'5.1.1 Not our Customer' 1
452 4.1.0 ... temporary failure 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.

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