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: 13,921,477

Open Rate to comcast.net: 1,845,459 (13.3%)

Date range:
Display as:

Sent vs Opens for comcast.net

Date Sent Opens Open Rate
4/20/2021 21,553 1,670 0.0%
4/19/2021 24,434 2,498 0.0%
4/18/2021 18,619 1,842 0.0%
4/16/2021 31,927 3,949 0.0%
4/15/2021 35,592 3,955 0.0%
4/14/2021 32,267 3,953 0.0%
4/13/2021 30,116 3,366 0.0%
4/12/2021 21,471 2,570 0.0%
4/11/2021 11,586 1,236 0.0%
4/10/2021 13,860 1,725 0.0%
4/9/2021 20,206 2,526 0.0%
4/8/2021 24,218 2,746 0.0%
4/7/2021 27,398 3,333 0.0%
4/6/2021 20,231 2,424 0.0%
4/5/2021 22,735 2,722 0.0%
4/4/2021 9,549 1,236 0.0%
4/3/2021 12,924 1,527 0.0%
4/2/2021 16,667 2,190 0.0%
4/1/2021 20,237 2,490 0.0%
3/31/2021 22,106 2,806 0.0%
3/30/2021 21,662 2,743 0.0%
3/29/2021 20,732 2,541 0.0%
3/28/2021 11,184 1,178 0.0%
3/27/2021 17,892 1,977 0.0%
3/26/2021 20,401 2,607 0.0%
3/25/2021 19,804 2,580 0.0%
3/24/2021 22,358 2,351 0.0%
3/23/2021 21,296 2,170 0.0%
3/22/2021 18,727 2,235 0.0%
3/21/2021 12,733 1,206 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 4,621
550 4.2.0 Not our Customer 766
554 5.1.0 149.72.178.71 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 239
Email was deferred due to the following reason: 133
550 5.1.1 recipient unallocated 83
552 5.1.1 recipient rejected - extended quota violation 82
550 5.2.0 Message rejected due to DMARC. Please see http://postmaster.comcast.net/smtp-error-codes.php#DM000001 47
450 4.2.0 - Recipient temporarily unavailable 45
452 4.1.1 user over quota 22
550 5.2.0 - Recipient unavailable 19
SMTP; 550 5.1.1 Not our Customer 18
550 4.2.0 recipient unallocated 13
554 5.1.0 149.72.167.192 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 12
NoMxRecord:0-0 12
550 5.2.0 Not our Customer 10
552 :: auth :: Message rejected for spam or virus content :: 9
535 Authentication Failed for 8
550 5.1.0 Invalid sender domain 4
550 5.1.10 Recipient not found by SMTP address lookup 3
452 4.2.0 user over quota 2
452 4.1.0 ... temporary failure 2
554 5.1.0 192.185.26.22 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 5.1.0 149.72.32.168 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
535 Incorrect authentication data 1
SMTP; 550 Recipient rejected 1
550 5.1.8 Access denied, bad outbound sender AS 1
452 4.2.0 ... temporary failure 1
550 Could not send message at it contains too many spam like characteristics 1
550 5.4.1 Recipient address rejected: Access denied. AS 1
421 4.1.0 192.185.30.21 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 1
421 Too many sessions opened 1
550 5.1.1 Recipient not found. 1
535 5.7.8 Error: authentication failed: 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 5.4.12 SMTP; Hop count exceeded - possible mail loop detected on message id 1
554 5.2.2 Mailbox full. Visit aka.ms/mailboxfull for more info.; Failed to process message due to a permanent exception with message The process failed to get the correct properties. 0.35250A001F67, 1.36674, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866B000000, 1.36674:A1000000, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 16.55847, 17.43559C6030000000000000100000000000000, 20.52176FB48F1800 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.